diff --git a/src/main/java/info/istlab/ServerTester/MulticastReceiver.java b/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
index 85dcbf0..7d647a9 100644
--- a/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
+++ b/src/main/java/info/istlab/ServerTester/MulticastReceiver.java
@@ -4,10 +4,15 @@
 import java.net.DatagramPacket;
 import java.net.InetAddress;
 import java.net.MulticastSocket;
+import java.util.Hashtable;
 
 public class MulticastReceiver implements Runnable{
     Thread thread;
     MulticastSocket socket;
+
+    // 受信したデータを IP アドレスをキーにして保存
+    Hashtable<String, String> receivedData = new Hashtable<String, String>();
+
     public MulticastReceiver() {
         try {
             socket = new MulticastSocket(54320);
@@ -31,6 +36,8 @@
             }
             String addr = packet.getAddress().getHostAddress();
             String message = new String(packet.getData(), 0, packet.getLength());
+            receivedData.put(addr, message);
+
             System.out.println(addr+"からの受信: " + message);
 
         }