diff --git a/.gitignore b/.gitignore
new file mode 100644
index 00000000..3551ef14
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+.gradle
+.idea
+build
+gradle
+out
diff --git a/build.gradle b/build.gradle
new file mode 100644
index 00000000..3cae2d72
--- /dev/null
+++ b/build.gradle
@@ -0,0 +1,19 @@
+plugins {
+    id 'java'
+}
+
+group 'org.example'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+}
+
+test {
+    useJUnitPlatform()
+}
\ No newline at end of file
diff --git a/docs/feature_list.md b/docs/feature_list.md
new file mode 100644
index 00000000..46ad480e
--- /dev/null
+++ b/docs/feature_list.md
@@ -0,0 +1,41 @@
+# 기능 목록
+
+
+## 콘솔, 파일을 통해 고객 등급(group) 분류 기준 CRU
+1. [ ] 콘솔 및 파일을 통해 분류 기준 입력 받음
+2. [X] 분류 기준 설정
+3. [X] 분류 기준 조회
+3. [X] 분류 기준 수정
+
+
+## 고객 등급 분류 기능
+(정렬 시 오름차순 또는 내림차순 선택 기능 추가)
+1.[X] 분류기준에 따른 고객 분류
+2.[X] 분류기준으로 분류된 고객 정보 출력
+3.[X] 분류기준으로 분류된 고객 정보를 이름순(name) 정렬
+4.[X] 분류기준으로 분류된 고객 정보를 총 이용시간(hours) 순으로 정렬
+5. [X] 분류기준으로 분류된 고객 정보를 총 결제금액(totalAmount) 순으로 정렬
+
+## 콘솔, 파일을 통해 고객 정보 CRUD
+1. [ ] 고객 정보 입력 기능
+2. [x] 고객 정보 추가
+2. [X] 고객 정보 수정
+3. [X] 고객 정보 조회
+4. [X] 고객 정보 삭제
+
+
+## 예외처리
+1. [ ] 고객 분류 기준이 추가될 경우 수정된 분류기준에 따라 고객 재분류 가능해야한다.
+2. [X] 고객 정보가 추가될 때, 다음 시나리오에 대한 예외 처리
+    - 배열의 크기가 부족할 수 있음
+   - 배열 크기 더블링 (x2, x1.xx)
+   - 기존 배열의 크기가 5 일 경우, 6번째 고객이 들어온다고 가정.
+   - 배열의 크기를 더블링 시키고 (10)
+   - 기존 배열의 데이터를 복붙하고
+   - 6번째 고객의 정보도 저장한다.
+3. [ ] 고객 정보가 추가될 때, 다음 시나리오에 대한 예외 처리
+   - 배열 구멍 뚫리면 안됨
+   - 0, 1, 2: null, 3, 4 ⇒ 0, 1, 2, 3, 4: null
+4. [ ] 배열의 저장범위를 벗어나게 되면 생기는 예외 처리
+5. [ ] 상황에 알맞는 사용자 정의 예외 클래스 만들기
+   
\ No newline at end of file
diff --git a/gradlew b/gradlew
new file mode 100644
index 00000000..1b6c7873
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,234 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/master/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
+
+APP_NAME="Gradle"
+APP_BASE_NAME=${0##*/}
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+# Collect all arguments for the java command;
+#   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
+#     shell script including quotes and variable substitutions, so put them in
+#     double quotes to make sure that they get re-expanded; and
+#   * put everything else in single quotes, so that it's not re-expanded.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 00000000..107acd32
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/settings.gradle b/settings.gradle
new file mode 100644
index 00000000..92426426
--- /dev/null
+++ b/settings.gradle
@@ -0,0 +1,2 @@
+rootProject.name = 'KDTBE5_Java_ToyProject'
+
diff --git a/src/main/java/me/smartstore/Main.java b/src/main/java/me/smartstore/Main.java
new file mode 100644
index 00000000..9c20405d
--- /dev/null
+++ b/src/main/java/me/smartstore/Main.java
@@ -0,0 +1,10 @@
+package me.smartstore;
+
+import me.smartstore.runner.MainRunner;
+
+public class Main {
+    public static void main(String[] args) {
+        MainRunner mainRunner = MainRunner.getInstance();
+        mainRunner.run();
+    }
+}
diff --git a/src/main/java/me/smartstore/collections/MyArrayList.java b/src/main/java/me/smartstore/collections/MyArrayList.java
new file mode 100644
index 00000000..028cf892
--- /dev/null
+++ b/src/main/java/me/smartstore/collections/MyArrayList.java
@@ -0,0 +1,138 @@
+package me.smartstore.collections;
+
+import me.smartstore.menu.OrderType;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Iterator;
+import java.util.Spliterator;
+import java.util.function.Consumer;
+
+public class MyArrayList<T> implements MyList<T> {
+    private int size;
+    private static final int DEFAULT_CAPACITY = 50;
+    private T[] elements;
+
+    public MyArrayList() {
+        this.size = 0;
+        this.elements = (T[]) new Object[DEFAULT_CAPACITY];
+    }
+
+    @Override
+    public void add(T t) {
+        if (size == elements.length) {
+            elements = Arrays.copyOf(elements, size * 2);
+        }
+        this.elements[size++] = t;
+    }
+
+    //@Todo: 테스트해야됨
+    @Override
+    public void add(int index, T t) {
+        if (size == elements.length) {
+            elements = Arrays.copyOf(elements, size * 2);
+        }
+        System.arraycopy(elements, index, elements, index + 1, size - index);
+        elements[index] = t;
+        size++;
+    }
+
+    @Override
+    public void clear() {
+        elements = (T[]) new Object[DEFAULT_CAPACITY];
+        size = 0;
+
+    }
+
+    @Override
+    public boolean contains(T t) {
+        for (T element : elements) {
+            if (element.equals(t)) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return size == 0;
+    }
+
+    @Override
+    public boolean remove(T t) {
+        for (int i = 0; i < size; i++) {
+            if (elements[i].equals(t)) {
+                for (int j = i; j < size - 1; j++) {
+                    elements[j] = elements[j + 1];
+                }
+                size--;
+                return true;
+            }
+        }
+        return false;
+    }
+
+    public boolean remove(int index) {
+        if (index < 0 || index > size - 1) {
+            return false;
+        }
+        for (int i = index; i < size - 1; i++) {
+            elements[i] = elements[i + 1];
+        }
+        size--;
+        return true;
+    }
+
+    @Override
+    public int size() {
+        return size;
+    }
+
+    @Override
+    public void set(int index, T t) {
+
+    }
+
+    @Override
+    public int indexOf(T t) {
+        for (int i = 0; i < size; i++) {
+            if (elements[i].equals(t)) {
+                return i;
+            }
+        }
+        return -1;
+    }
+
+    @Override
+    public T get(int index) {
+        if (index < 0 || index >= size) {
+            throw new IndexOutOfBoundsException();
+        }
+        return elements[index];
+    }
+
+    public void sort(OrderType orderType) {
+        if (orderType == OrderType.DESCENDING) {
+            Arrays.sort(elements, Collections.reverseOrder());
+            return;
+        }
+        Arrays.sort(elements);
+    }
+
+    //@Todo Iterator, forEach, Spliterator구현해야됨;;
+    @Override
+    public Iterator<T> iterator() {
+        return null;
+    }
+
+    @Override
+    public void forEach(Consumer<? super T> action) {
+        MyList.super.forEach(action);
+    }
+
+    @Override
+    public Spliterator<T> spliterator() {
+        return MyList.super.spliterator();
+    }
+}
diff --git a/src/main/java/me/smartstore/collections/MyCollection.java b/src/main/java/me/smartstore/collections/MyCollection.java
new file mode 100644
index 00000000..5038cc32
--- /dev/null
+++ b/src/main/java/me/smartstore/collections/MyCollection.java
@@ -0,0 +1,15 @@
+package me.smartstore.collections;
+
+public interface MyCollection<T> extends Iterable<T> {
+    void add(T t);
+
+    void clear();
+
+    boolean contains(T t);
+
+    boolean isEmpty();
+
+    boolean remove(T t);
+
+    int size();
+}
diff --git a/src/main/java/me/smartstore/collections/MyList.java b/src/main/java/me/smartstore/collections/MyList.java
new file mode 100644
index 00000000..ddfc40f7
--- /dev/null
+++ b/src/main/java/me/smartstore/collections/MyList.java
@@ -0,0 +1,11 @@
+package me.smartstore.collections;
+
+public interface MyList<T> extends MyCollection<T> {
+    void add(int index, T t);
+    void set(int index, T t);
+
+    int indexOf(T t);
+
+    boolean remove(int index);
+    T get(int index);
+}
diff --git a/src/main/java/me/smartstore/customer/ClassifiedCustomers.java b/src/main/java/me/smartstore/customer/ClassifiedCustomers.java
new file mode 100644
index 00000000..02002bd6
--- /dev/null
+++ b/src/main/java/me/smartstore/customer/ClassifiedCustomers.java
@@ -0,0 +1,71 @@
+package me.smartstore.customer;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.group.GroupType;
+
+public class ClassifiedCustomers {
+    private MyArrayList<Customer> classifiedByGeneral;
+    private MyArrayList<Customer> classifiedByVIP;
+    private MyArrayList<Customer> classifiedByVVIP;
+    private MyArrayList<MyArrayList<Customer>> classifications;
+    private static ClassifiedCustomers classifiedCustomers;
+    private SortBy sortBy;
+
+    private ClassifiedCustomers() {
+    }
+
+    public static ClassifiedCustomers getInstance() {
+        if (classifiedCustomers == null) {
+            classifiedCustomers = new ClassifiedCustomers();
+        }
+        return classifiedCustomers;
+    }
+
+    public void refresh() {
+        Customers customers = Customers.getInstance();
+        MyArrayList<Customer> customerList = customers.getCustomers();
+        initCustomerList();
+
+        for (Customer customer : customerList) {
+            if (customer.getGroup() == GroupType.GENERAL) {
+                classifiedByGeneral.add(customer);
+                continue;
+            }
+            if (customer.getGroup() == GroupType.VIP) {
+                classifiedByVIP.add(customer);
+                continue;
+            }
+            classifiedByVVIP.add(customer);
+        }
+    }
+
+    private void initCustomerList() {
+        classifiedByGeneral = new MyArrayList<>();
+        classifiedByVIP = new MyArrayList<>();
+        classifiedByVVIP = new MyArrayList<>();
+    }
+
+    public MyArrayList<Customer> getClassifiedByGeneral() {
+        return classifiedByGeneral;
+    }
+
+    public MyArrayList<Customer> getClassifiedByVIP() {
+        return classifiedByVIP;
+    }
+
+    public MyArrayList<Customer> getClassifiedByVVIP() {
+        return classifiedByVVIP;
+    }
+
+    public MyArrayList<MyArrayList<Customer>> getClassifications() {
+        return classifications;
+    }
+
+    public SortBy getSortBy() {
+        return sortBy;
+    }
+
+    public void setSortBy(SortBy sortBy) {
+        this.sortBy = sortBy;
+    }
+}
diff --git a/src/main/java/me/smartstore/customer/Customer.java b/src/main/java/me/smartstore/customer/Customer.java
new file mode 100644
index 00000000..4e706718
--- /dev/null
+++ b/src/main/java/me/smartstore/customer/Customer.java
@@ -0,0 +1,124 @@
+package me.smartstore.customer;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.group.Group;
+import me.smartstore.group.GroupType;
+import me.smartstore.group.Groups;
+
+import java.util.Objects;
+
+public class Customer implements Comparable<Customer> {
+    private String name;
+    private String id;
+    private int hours;
+    private int totalAmount;
+    private GroupType group;
+    private ClassifiedCustomers classifiedCustomers;
+
+    public Customer(String name, String id, int hours, int totalAmount) {
+        this.name = name;
+        this.id = id;
+        this.hours = hours;
+        this.totalAmount = totalAmount;
+        this.group = judgeCustomerGroup(hours, totalAmount);
+        this.classifiedCustomers = ClassifiedCustomers.getInstance();
+    }
+
+    private GroupType judgeCustomerGroup(int hours, int totalAmount) {
+        //정렬된 groups요소를 돌며 그 요소의 기준 미만이라면 그 grouptype으로 설정
+        Groups groups = Groups.getInstance();
+        MyArrayList<Group> groupList = groups.getGroups();
+        for (int i = 0; i < groupList.size() - 1; i++) {
+            int currentMinimumHours = groupList.get(i).getParameter().getMinimumHours();
+            int currentMinimumTotalAmount = groupList.get(i).getParameter().getMinimumTotalAmount();
+            int nextMinimumHours = groupList.get(i + 1).getParameter().getMinimumHours();
+            int nextMinimumTotalAmount = groupList.get(i + 1).getParameter().getMinimumTotalAmount();
+
+            //어떤 기준도 충족 못시킬 때
+            if (hours <= currentMinimumHours || totalAmount <= currentMinimumTotalAmount) {
+                return GroupType.getGroupType(i);
+            }
+            //현재 기준 충족 + 다음 기준 미충족 시 현재 기준에 해당하는 등급 부여
+            if (hours <= nextMinimumHours && totalAmount <= nextMinimumTotalAmount) {
+                return groupList.get(i).getCustomerGroup();
+            }
+        }
+        return GroupType.getGroupType(groupList.size() - 1);
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getId() {
+        return id;
+    }
+
+    public void setId(String id) {
+        this.id = id;
+    }
+
+    public int getHours() {
+        return hours;
+    }
+
+    public void setHours(int hours) {
+        this.hours = hours;
+    }
+
+    public int getTotalAmount() {
+        return totalAmount;
+    }
+
+    public void setTotalAmount(int totalAmount) {
+        this.totalAmount = totalAmount;
+    }
+
+    public GroupType getGroup() {
+        return group;
+    }
+
+    public void setGroup(GroupType group) {
+        this.group = group;
+    }
+
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        Customer customer = (Customer) o;
+        return hours == customer.hours && totalAmount == customer.totalAmount && Objects.equals(name, customer.name) && Objects.equals(id, customer.id) && group == customer.group;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(name, id, hours, totalAmount, group);
+    }
+
+    @Override
+    public String toString() {
+        return "Customer{" +
+                "name='" + name + '\'' +
+                ", id='" + id + '\'' +
+                ", hours=" + hours +
+                ", totalAmount=" + totalAmount +
+                ", group=" + group +
+                '}';
+    }
+
+
+    @Override
+    public int compareTo(Customer o) {
+        if (classifiedCustomers.getSortBy() == SortBy.NAME) {
+            return this.name.compareTo(o.name);
+        }
+        if (classifiedCustomers.getSortBy() == SortBy.HOURS) {
+            return this.hours - o.hours;
+        }
+        return this.totalAmount - o.totalAmount;
+    }
+}
diff --git a/src/main/java/me/smartstore/customer/Customers.java b/src/main/java/me/smartstore/customer/Customers.java
new file mode 100644
index 00000000..7e57babb
--- /dev/null
+++ b/src/main/java/me/smartstore/customer/Customers.java
@@ -0,0 +1,63 @@
+package me.smartstore.customer;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.group.Group;
+import me.smartstore.group.GroupType;
+import me.smartstore.group.Groups;
+
+import java.util.Arrays;
+
+public class Customers {
+    private static Customers instance;
+    private Groups groups;
+    private final MyArrayList<Customer> customers = new MyArrayList<>();
+
+    private Customers() {
+        groups = Groups.getInstance();
+    }
+
+    public static Customers getInstance() {
+        if (instance == null) {
+            instance = new Customers();
+        }
+        return instance;
+    }
+
+    public void refreshCustomersGroup() {
+        MyArrayList<Group> groupList = groups.getGroups();
+
+        for (int i = 0; i < customers.size(); i++) {
+            Customer currentCustomer = customers.get(i);
+            int hours = currentCustomer.getHours();
+            int totalAmount = currentCustomer.getTotalAmount();
+
+            for (int j = 0; j < groupList.size() - 1; j++) {
+                int currentMinimumHours = groupList.get(j).getParameter().getMinimumHours();
+                int currentMinimumTotalAmount = groupList.get(j).getParameter().getMinimumTotalAmount();
+                int nextMinimumHours = groupList.get(j + 1).getParameter().getMinimumHours();
+                int nextMinimumTotalAmount = groupList.get(j + 1).getParameter().getMinimumTotalAmount();
+                //어떤 기준도 충족 못시킬 때
+                if (hours <= currentMinimumHours || totalAmount <= currentMinimumTotalAmount) {
+                    currentCustomer.setGroup(GroupType.getGroupType(j));
+                    break;
+                }
+                if (hours <= nextMinimumHours && totalAmount <= nextMinimumTotalAmount) {
+                    currentCustomer.setGroup(GroupType.getGroupType(j));
+                    break;
+                }
+            }
+            currentCustomer.setGroup(GroupType.getGroupType(groupList.size() - 1));
+        }
+    }
+
+    public MyArrayList<Customer> getCustomers() {
+        return customers;
+    }
+
+    @Override
+    public String toString() {
+        return "Customers{" +
+                "customers=" + customers +
+                '}';
+    }
+}
diff --git a/src/main/java/me/smartstore/customer/SortBy.java b/src/main/java/me/smartstore/customer/SortBy.java
new file mode 100644
index 00000000..ddba7e13
--- /dev/null
+++ b/src/main/java/me/smartstore/customer/SortBy.java
@@ -0,0 +1,10 @@
+package me.smartstore.customer;
+
+public enum SortBy {
+    NAME,
+    HOURS,
+    TOTAL_AMOUNT;
+
+
+
+}
diff --git a/src/main/java/me/smartstore/group/Group.java b/src/main/java/me/smartstore/group/Group.java
new file mode 100644
index 00000000..ea7effcb
--- /dev/null
+++ b/src/main/java/me/smartstore/group/Group.java
@@ -0,0 +1,19 @@
+package me.smartstore.group;
+
+public class Group {
+    private GroupType customerGroup;
+    private Parameter parameter;
+
+    public Group(GroupType customerGroup, Parameter parameter) {
+        this.customerGroup = customerGroup;
+        this.parameter = parameter;
+    }
+
+    public GroupType getCustomerGroup() {
+        return customerGroup;
+    }
+
+    public Parameter getParameter() {
+        return parameter;
+    }
+}
diff --git a/src/main/java/me/smartstore/group/GroupType.java b/src/main/java/me/smartstore/group/GroupType.java
new file mode 100644
index 00000000..3b6db59a
--- /dev/null
+++ b/src/main/java/me/smartstore/group/GroupType.java
@@ -0,0 +1,13 @@
+package me.smartstore.group;
+
+public enum GroupType {
+    GENERAL,
+    VIP,
+    VVIP;
+
+    private static final GroupType[] groupTypes = GroupType.values();
+
+    public static GroupType getGroupType(int i) {
+        return groupTypes[i];
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/me/smartstore/group/Groups.java b/src/main/java/me/smartstore/group/Groups.java
new file mode 100644
index 00000000..65f3ed24
--- /dev/null
+++ b/src/main/java/me/smartstore/group/Groups.java
@@ -0,0 +1,32 @@
+package me.smartstore.group;
+
+import me.smartstore.collections.MyArrayList;
+
+public class Groups {
+    private MyArrayList<Group> groups = new MyArrayList<>();
+    private static Groups instance;
+
+    private Groups() {
+        groups.add(new Group(GroupType.GENERAL, new Parameter()));
+        groups.add(new Group(GroupType.VIP, new Parameter()));
+        groups.add(new Group(GroupType.VVIP, new Parameter()));
+    }
+
+    public static Groups getInstance() {
+        if (instance == null) {
+            instance = new Groups();
+        }
+        return instance;
+    }
+
+    public MyArrayList<Group> getGroups() {
+        return groups;
+    }
+
+    @Override
+    public String toString() {
+        return "Groups{" +
+                "groups=" + groups +
+                '}';
+    }
+}
diff --git a/src/main/java/me/smartstore/group/Parameter.java b/src/main/java/me/smartstore/group/Parameter.java
new file mode 100644
index 00000000..bef13bd5
--- /dev/null
+++ b/src/main/java/me/smartstore/group/Parameter.java
@@ -0,0 +1,36 @@
+package me.smartstore.group;
+
+public class Parameter {
+    private int minimumHours;
+    private int minimumTotalAmount;
+
+    public Parameter(){}
+    public Parameter(int minimumHours, int minimumTotalAmount) {
+        this.minimumHours = minimumHours;
+        this.minimumTotalAmount = minimumTotalAmount;
+    }
+
+    public int getMinimumHours() {
+        return minimumHours;
+    }
+
+    public void setMinimumHours(int minimumHours) {
+        this.minimumHours = minimumHours;
+    }
+
+    public int getMinimumTotalAmount() {
+        return minimumTotalAmount;
+    }
+
+    public void setMinimumTotalAmount(int minimumTotalAmount) {
+        this.minimumTotalAmount = minimumTotalAmount;
+    }
+
+    @Override
+    public String toString() {
+        return "Parameter{" +
+                "minimumHours=" + minimumHours +
+                ", minimumTotalAmount=" + minimumTotalAmount +
+                '}';
+    }
+}
diff --git a/src/main/java/me/smartstore/menu/CustomerMenu.java b/src/main/java/me/smartstore/menu/CustomerMenu.java
new file mode 100644
index 00000000..26b5fc0c
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/CustomerMenu.java
@@ -0,0 +1,176 @@
+package me.smartstore.menu;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.customer.Customer;
+
+import java.io.IOException;
+
+public class CustomerMenu extends Menu implements DataCRUD {
+    private static CustomerMenu customerMenu;
+
+    private CustomerMenu() {
+    }
+
+    public static CustomerMenu getInstance() {
+        if (customerMenu == null) {
+            customerMenu = new CustomerMenu();
+        }
+        return customerMenu;
+    }
+
+    public void run() {
+        int customerMenuNumber = 0;
+        while (customerMenuNumber != 5) {
+            printCustomerInitMenu();
+            customerMenuNumber = readNumber(5);
+            if (customerMenuNumber == 1) {
+                addData();
+            } else if (customerMenuNumber == 2) {
+                viewData();
+            } else if (customerMenuNumber == 3) {
+                updateData();
+            } else if (customerMenuNumber == 4) {
+                deleteData();
+            }
+        }
+    }
+
+    @Override
+    public void addData() {
+        try {
+            Customer customer = inputCustomerData();
+            MyArrayList<Customer> customerList = customers.getCustomers();
+            customerList.add(customer);
+        } catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    //@Todo 예외처리
+    private Customer inputCustomerData() throws IOException {
+        //이름, id, 누적 시간, 누적 결제 금액을 차례로 입력받도록 함.
+        System.out.println("이름을 입력하세요");
+        String name = br.readLine();
+        System.out.println("ID를 입력하세요");
+        String id = br.readLine();
+        System.out.println("누적 이용시간을 입력하세요.");
+        int hour = Integer.parseInt(br.readLine());
+        System.out.println("누적 결제금액을 입력하세요.");
+        int totalAmount = Integer.parseInt(br.readLine());
+
+        return new Customer(name, id, hour, totalAmount);
+    }
+
+    @Override
+    public void viewData() {
+        if (validator.isCustomerListEmpty()) {
+            return;
+        }
+        MyArrayList<Customer> customerList = customers.getCustomers();
+        for (int i = 0; i < customerList.size(); i++) {
+            System.out.println(customerList.get(i));
+        }
+    }
+
+    @Override
+    public void updateData() {
+        //변경할 요소의 index를 입력받음 -> 수정 희망하는 정보 받음
+        viewData();
+        MyArrayList<Customer> customerList = getCustomers();
+        if (customerList == null) {
+            return;
+        }
+        int listSize = customerList.size();
+        System.out.print("수정을 희망하는 고객 번호를 입력해주세요");
+        System.out.print(listSize >= 2 ? "(1~" + listSize + ")" : "");
+        int customerNumber = readNumber(listSize);
+
+        printCustomerUpdateMessage();
+        int updateMenuNumber = 0;
+        try {
+            updateMenuNumber = Integer.parseInt(br.readLine());
+            if (updateMenuNumber == 5) {
+                return;
+            }
+            inputNewData(updateMenuNumber, customerNumber);
+        } catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private MyArrayList<Customer> getCustomers() {
+        MyArrayList<Customer> customerList = customers.getCustomers();
+        if (customerList.isEmpty()) {
+            System.out.println("등록된 고객정보가 존재하지 않습니다.");
+            //예외발생 vs null리턴?
+            return null;
+        }
+        return customerList;
+    }
+
+    private void printCustomerUpdateMessage() {
+        System.out.println("==============================");
+        System.out.println("수정할 정보를 선택해주세요");
+        System.out.println("1. 이름");
+        System.out.println("2. ID");
+        System.out.println("3. 누적 이용 시간");
+        System.out.println("4. 누적 결제 금액");
+        System.out.println("5. 수정 취소");
+        System.out.println("==============================");
+        System.out.print("수정할 정보를 선택해주세요(1~5): ");
+    }
+
+    private void inputNewData(int updateMenuNumber, int customerNumber) throws IOException {
+        MyArrayList<Customer> customerList = customers.getCustomers();
+        Customer customer = customerList.get(customerNumber - 1);
+
+        if (updateMenuNumber == 1) {
+            System.out.println("새로운 이름을 입력해주세요.");
+            String name = br.readLine();
+            customer.setName(name);
+            return;
+        }
+        if (updateMenuNumber == 2) {
+            System.out.println("새로운 ID를 입력해주세요.");
+            String id = br.readLine();
+            customer.setId(id);
+            return;
+        }
+        if (updateMenuNumber == 3) {
+            System.out.println("새로운 누적 이용 시간을 입력해주세요.");
+            int hours = Integer.parseInt(br.readLine());
+            customer.setHours(hours);
+            return;
+        }
+        System.out.println("새로운 누적 결제 금액을 입력해주세요.");
+        int totalAmount = Integer.parseInt(br.readLine());
+        customer.setTotalAmount(totalAmount);
+    }
+
+    @Override
+    public void deleteData() {
+        viewData();
+        MyArrayList<Customer> customerList = customers.getCustomers();
+        int listSize = customerList.size();
+        if (listSize < 1) {
+            System.out.println("고객이 존재하지 않습니다.");
+            return;
+        }
+        //@Todo 뒤로가기 추가
+        System.out.print("삭제할 고객 번호를 입력해주세요");
+        System.out.print(listSize >= 2 ? "(1~" + listSize + ")" : "");
+        int customerNumber = readNumber(listSize);
+        customerList.remove(customerNumber);
+    }
+
+    public void printCustomerInitMenu() {
+        System.out.println("==============================");
+        System.out.println("1. 고객 정보 추가");
+        System.out.println("2. 고객 정보 조회");
+        System.out.println("3. 고객 정보 수정");
+        System.out.println("4. 고객 정보 삭제");
+        System.out.println("5. 뒤로 가기");
+        System.out.println("==============================");
+        System.out.print("메뉴번호를 입력해주세요: ");
+    }
+}
diff --git a/src/main/java/me/smartstore/menu/DataCRUD.java b/src/main/java/me/smartstore/menu/DataCRUD.java
new file mode 100644
index 00000000..6d647cc5
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/DataCRUD.java
@@ -0,0 +1,12 @@
+package me.smartstore.menu;
+
+public interface DataCRUD {
+
+    void addData();
+
+    void viewData();
+
+    void updateData();
+
+    void deleteData();
+}
diff --git a/src/main/java/me/smartstore/menu/GroupMenu.java b/src/main/java/me/smartstore/menu/GroupMenu.java
new file mode 100644
index 00000000..e6269d17
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/GroupMenu.java
@@ -0,0 +1,162 @@
+package me.smartstore.menu;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.group.Group;
+import me.smartstore.group.GroupType;
+import me.smartstore.group.Parameter;
+
+import java.io.IOException;
+import java.util.NoSuchElementException;
+
+public class GroupMenu extends Menu implements DataCRUD {
+    private static GroupMenu groupMenu;
+
+    private GroupMenu() {
+    }
+
+    public static GroupMenu getInstance() {
+        if (groupMenu == null) {
+            groupMenu = new GroupMenu();
+        }
+        return groupMenu;
+    }
+
+    public void run() {
+        int groupMenu = 0;
+        while (groupMenu != 4) {
+            printGroupInitMenu();
+            groupMenu = readNumber(4);
+            if (groupMenu == 1) {
+                addData();
+            } else if (groupMenu == 2) {
+                viewData();
+            } else if (groupMenu == 3) {
+                updateData();
+            }
+        }
+    }
+
+    @Override
+    public void addData() {
+        //변경할 등급 선택
+        printGroupSelectionMessage();
+        int groupNumber = readNumber(3);
+        //groupNumber to group
+        GroupType groupType = groupNumberToGroupType(groupNumber);
+        //groupList에서 입력받은 등급에 해당하는 요소를 찾음
+        insert(groupType);
+    }
+
+
+    private void printGroupSelectionMessage() {
+        System.out.println("다음 등급 중 하나를 선택해주세요.");
+        System.out.println("1. GENERAL");
+        System.out.println("2. VIP");
+        System.out.println("3. VVIP");
+        System.out.println("==============================");
+        System.out.print("번호를 입력해주세요: ");
+    }
+
+    private GroupType groupNumberToGroupType(int groupNumber) {
+        if (groupNumber == 1) {
+            return GroupType.GENERAL;
+        }
+        if (groupNumber == 2) {
+            return GroupType.VIP;
+        }
+        return GroupType.VVIP;
+    }
+
+    private void insert(GroupType groupType) {
+        Parameter parameter = findParameter(groupType);
+        //찾은 요소가 이미 입력이 된 경우 return
+        if (parameter.getMinimumHours() != 0 || parameter.getMinimumTotalAmount() != 0) {
+            System.out.println("이미 기준이 등록된 등급입니다.");
+            return;
+        }
+        insertInputParameter(parameter);
+    }
+
+    private void insertInputParameter(Parameter parameter) {
+        //기준을 입력할 메뉴 입력 1: 누적 시간/ 2: 누적 결제 금액
+        printInsertParameterMessage();
+        int parameterNumber = readNumber(3);
+        try {
+            //누적 시간 입력 받음
+            if (parameterNumber == 1) {
+                System.out.println("누적 이용 시간을 입력해주세요.");
+                int hours = Integer.parseInt(br.readLine());
+                parameter.setMinimumHours(hours);
+
+            } else if (parameterNumber == 2) {
+                //누적 결제 금액 입력 받음
+                System.out.println("누적 결제 금액을 입력해주세요.");
+                int totalAmount = Integer.parseInt(br.readLine());
+                parameter.setMinimumTotalAmount(totalAmount);
+            } else {
+                customers.refreshCustomersGroup();
+                return;
+            }
+            //3이 입력되기 전까지 재귀 호출해서 메뉴 실행 상태 유지
+            insertInputParameter(parameter);
+        } catch (IOException e) {
+            System.out.println(e.getMessage());
+        }
+    }
+
+    private void printInsertParameterMessage() {
+        System.out.println("==============================");
+        System.out.println("다음 중 입력할 기준을 선택해주세요.");
+        System.out.println("1. 누적 이용 시간");
+        System.out.println("2. 누적 결제 금액");
+        System.out.println("3. 뒤로 가기");
+        System.out.println("==============================");
+    }
+
+    private Parameter findParameter(GroupType groupType) {
+        if (validator.isGroupListEmpty()) {
+            return null;
+        }
+        MyArrayList<Group> groupList = groups.getGroups();
+        for (int i = 0; i < groupList.size(); i++) {
+            if (groupList.get(i).getCustomerGroup() == groupType) {
+                return groupList.get(i).getParameter();
+            }
+        }
+        throw new NoSuchElementException("해당하는 등급이 존재하지 않습니다.");
+    }
+
+    @Override
+    public void viewData() {
+        printGroupSelectionMessage();
+        int groupNumber = readNumber(3);
+        //groupNumber to group
+        GroupType groupType = groupNumberToGroupType(groupNumber);
+        Parameter parameter = findParameter(groupType);
+        System.out.println(parameter);
+    }
+
+    @Override
+    public void updateData() {
+        printGroupSelectionMessage();
+        int groupNumber = readNumber(3);
+        GroupType groupType = groupNumberToGroupType(groupNumber);
+        Parameter parameter = findParameter(groupType);
+        insertInputParameter(parameter);
+    }
+
+    @Override
+    public void deleteData() {
+
+    }
+
+    public void printGroupInitMenu() {
+        System.out.println("==============================");
+        System.out.println("1. 고객 등급 기준 추가");
+        System.out.println("2. 고객 등급 기준 조회");
+        System.out.println("3. 고객 등급 기준 수정");
+        System.out.println("4. 뒤로 가기");
+        System.out.println("==============================");
+        System.out.print("메뉴번호를 입력해주세요: ");
+    }
+}
diff --git a/src/main/java/me/smartstore/menu/Menu.java b/src/main/java/me/smartstore/menu/Menu.java
new file mode 100644
index 00000000..e5ad5d73
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/Menu.java
@@ -0,0 +1,67 @@
+package me.smartstore.menu;
+
+import me.smartstore.customer.Customer;
+import me.smartstore.customer.Customers;
+import me.smartstore.customer.ClassifiedCustomers;
+import me.smartstore.group.Groups;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class Menu {
+    private static Menu menu;
+    protected BufferedReader br;
+    protected Customers customers;
+    protected Groups groups;
+    protected ClassifiedCustomers classifiedCustomers;
+    protected Validator validator;
+
+    protected Menu() {
+        br = new BufferedReader(new InputStreamReader(System.in));
+        customers = Customers.getInstance();
+        groups = Groups.getInstance();
+        classifiedCustomers = ClassifiedCustomers.getInstance();
+        validator = Validator.getInstance();
+    }
+
+    public static Menu getInstance() {
+        if (menu == null) {
+            menu = new Menu();
+        }
+        return menu;
+    }
+
+    public int inputInitMenuNumber() {
+        printInitMenu();
+        return readNumber(4);
+    }
+
+    private void printInitMenu() {
+        System.out.println("==============================");
+        System.out.println("1. 고객 등급 기준 설정");
+        System.out.println("2. 고객 정보");
+        System.out.println("3. 등급별 고객 정보 요약");
+        System.out.println("4. 프로그램 종료");
+        System.out.println("==============================");
+        System.out.print("메뉴번호를 입력해주세요: ");
+
+    }
+
+    protected int readNumber(int end) {
+        int menuNumber = 0;
+        while (menuNumber == 0) {
+            try {
+                int temp = Integer.parseInt(br.readLine());
+                if (temp >= 1 && temp <= end) {
+                    menuNumber = temp;
+                } else {
+                    System.out.printf("1부터 %d까지의 숫자를 입력해주세요.\n", end);
+                }
+            } catch (IOException e) {
+                System.out.println(e.getMessage());
+            }
+        }
+        return menuNumber;
+    }
+}
diff --git a/src/main/java/me/smartstore/menu/OrderType.java b/src/main/java/me/smartstore/menu/OrderType.java
new file mode 100644
index 00000000..182f7423
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/OrderType.java
@@ -0,0 +1,15 @@
+package me.smartstore.menu;
+
+import me.smartstore.customer.SortBy;
+
+public enum OrderType {
+    NONE,
+    ACSENDING,
+    DESCENDING;
+
+    private static final OrderType[] orderTypes = OrderType.values();
+
+    public static OrderType getOrderType(int i) {
+        return orderTypes[i-1];
+    }
+}
diff --git a/src/main/java/me/smartstore/menu/SummaryMenu.java b/src/main/java/me/smartstore/menu/SummaryMenu.java
new file mode 100644
index 00000000..9899e126
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/SummaryMenu.java
@@ -0,0 +1,112 @@
+package me.smartstore.menu;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.customer.Customer;
+import me.smartstore.customer.SortBy;
+import me.smartstore.group.GroupType;
+
+import java.io.IOException;
+
+public class SummaryMenu extends Menu {
+    private static SummaryMenu summaryMenu;
+
+    private SummaryMenu() {
+    }
+
+    public static SummaryMenu getInstance() {
+        if (summaryMenu == null) {
+            summaryMenu = new SummaryMenu();
+        }
+        return summaryMenu;
+    }
+
+    public void run() {
+        if (validator.isCustomerListEmpty()) {
+            return;
+        }
+        classifiedCustomers.refresh();
+        int summaryNumber = 0;
+        while (summaryNumber != 5) {
+            summaryNumber = readNumber(5);
+            printSummaryInitMenu();
+            if (summaryNumber == 1) {
+                summary(OrderType.NONE);
+            } else if (summaryNumber == 2) {
+                summarySortByName();
+            } else if (summaryNumber == 3) {
+                summarySortByHours();
+            } else if (summaryNumber == 4) {
+                summarySortByTotalAmount();
+            }
+        }
+    }
+
+    private void summary(OrderType orderType) {
+        GroupType[] groupTypes = GroupType.values();
+        MyArrayList<MyArrayList<Customer>> classifications = classifiedCustomers.getClassifications();
+        printCustomerSummary(orderType, groupTypes, classifications);
+    }
+
+    private void printCustomerSummary(OrderType orderType, GroupType[] groupTypes, MyArrayList<MyArrayList<Customer>> classifications) {
+        for (int i = 0; i < GroupType.values().length; i++) {
+            System.out.println("==============================");
+            System.out.printf("그룹: %s", groupTypes[i]);
+            System.out.println("==============================");
+            MyArrayList<Customer> currentClassification = classifications.get(i);
+            if (orderType != OrderType.NONE) {
+                currentClassification.sort(orderType);
+            }
+            for (int j = 0; j < currentClassification.size(); i++) {
+                System.out.println(j + ": " + currentClassification.get(j));
+            }
+        }
+        System.out.println("==============================");
+    }
+
+    private void summarySortByName() {
+        OrderType orderType = inputOrderType();
+        //등급 기준에 따라 정렬
+        classifiedCustomers.setSortBy(SortBy.NAME);
+        summary(orderType);
+    }
+
+    private void summarySortByHours() {
+        OrderType orderType = inputOrderType();
+        classifiedCustomers.setSortBy(SortBy.HOURS);
+        summary(orderType);
+    }
+
+    private void summarySortByTotalAmount() {
+        OrderType orderType = inputOrderType();
+        classifiedCustomers.setSortBy(SortBy.TOTAL_AMOUNT);
+        summary(orderType);
+    }
+
+    private OrderType inputOrderType() {
+        //오름차순, 내림차순 입력(OrderType이용)
+        int ascendingNumber = 0;
+        while (ascendingNumber == 0) {
+            try {
+                int input = Integer.parseInt(br.readLine());
+                if (input == 1 || input == 2) {
+                    ascendingNumber = input;
+                }
+                System.out.println("1또는 2를 입력해주세요.");
+            } catch (IOException e) {
+                System.out.println(e.getMessage());
+            }
+        }
+        return OrderType.getOrderType(ascendingNumber);
+    }
+
+    public void printSummaryInitMenu() {
+        System.out.println("==============================");
+        System.out.println("1. 고객 정보 요약");
+        System.out.println("2. 고객 정보 요약(이름 순)");
+        System.out.println("3. 고객 정보 요약(누적 이용 시간 순)");
+        System.out.println("4. 고객 정보 요약(누적 결제 금액 순)");
+        System.out.println("5. 뒤로 가기");
+        System.out.println("==============================");
+        System.out.print("메뉴번호를 입력해주세요: ");
+    }
+}
diff --git a/src/main/java/me/smartstore/menu/Validator.java b/src/main/java/me/smartstore/menu/Validator.java
new file mode 100644
index 00000000..88bd41a5
--- /dev/null
+++ b/src/main/java/me/smartstore/menu/Validator.java
@@ -0,0 +1,43 @@
+package me.smartstore.menu;
+
+import me.smartstore.collections.MyArrayList;
+import me.smartstore.customer.Customer;
+import me.smartstore.customer.Customers;
+import me.smartstore.group.Group;
+import me.smartstore.group.Groups;
+
+public class Validator {
+    private static Validator validator;
+    private Customers customers;
+    private Groups groups;
+
+    private Validator() {
+        customers = Customers.getInstance();
+        groups = Groups.getInstance();
+    }
+
+    public static Validator getInstance() {
+        if (validator == null) {
+            validator = new Validator();
+        }
+        return validator;
+    }
+
+    public boolean isCustomerListEmpty() {
+        MyArrayList<Customer> customerList = customers.getCustomers();
+        if (customerList.isEmpty()) {
+            System.out.println("등록된 고객 정보가 존재하지 않습니다.");
+            return true;
+        }
+        return false;
+    }
+
+    public boolean isGroupListEmpty() {
+        MyArrayList<Group> groupList = groups.getGroups();
+        if (groupList.isEmpty()) {
+            System.out.println("등록된 등급 기준이 존재하지 않습니다");
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/src/main/java/me/smartstore/runner/MainRunner.java b/src/main/java/me/smartstore/runner/MainRunner.java
new file mode 100644
index 00000000..8894dac8
--- /dev/null
+++ b/src/main/java/me/smartstore/runner/MainRunner.java
@@ -0,0 +1,44 @@
+package me.smartstore.runner;
+
+import me.smartstore.menu.CustomerMenu;
+import me.smartstore.menu.GroupMenu;
+import me.smartstore.menu.Menu;
+import me.smartstore.menu.SummaryMenu;
+
+public class MainRunner {
+    private static MainRunner mainRunner;
+    private Menu menu;
+    private GroupMenu groupMenu;
+    private CustomerMenu customerMenu;
+    private SummaryMenu summaryMenu;
+
+    //runner -> GroupMenuRunner, SummaryMenuRunner, CustomerMenuRunner 로 분리
+    private MainRunner() {
+        this.menu = Menu.getInstance();
+        this.groupMenu = GroupMenu.getInstance();
+        this.summaryMenu = SummaryMenu.getInstance();
+        this.customerMenu = CustomerMenu.getInstance();
+    }
+
+    public static MainRunner getInstance() {
+        if (mainRunner == null) {
+            mainRunner = new MainRunner();
+        }
+        return mainRunner;
+    }
+
+    public void run() {
+        int initMenu = 0;
+        while (initMenu != 4) {
+            initMenu = menu.inputInitMenuNumber();
+            if (initMenu == 1) {
+                groupMenu.run();
+            } else if (initMenu == 2) {
+                customerMenu.run();
+            } else if (initMenu == 3) {
+                summaryMenu.run();
+            }
+        }
+    }
+
+}