diff --git a/src/main/java/info/istlab/ServerTester/EchoServer.java b/src/main/java/info/istlab/ServerTester/EchoServer.java
index 826645c..b65b092 100644
--- a/src/main/java/info/istlab/ServerTester/EchoServer.java
+++ b/src/main/java/info/istlab/ServerTester/EchoServer.java
@@ -30,25 +30,27 @@
 		BufferedReader br;
 		PrintStream os;
 		String line;
+		System.out.println("[ES] ES Unique ID: " + hashCode() + " for Bind-Addr: " + expectedAddress);
 		// サーバ側の処理の繰り返し
 		while (thread != null) {
 			try {
 				clientSocket = serverSocket.accept(); // 接続がくるまで、ここで待つ
-				System.out.println("[ES] accept");
-				System.out.println("[ES] " + clientSocket.toString());
+				System.out.println("[ES " + hashCode() + "] accept");
+				System.out.println("[ES " + hashCode() + "] " + clientSocket.toString());
 				br = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
 				os = new PrintStream(clientSocket.getOutputStream());
 				// クライアントからのメッセージを待ち、受け取ったメッセージをそのまま返す
 				while ((line = br.readLine()) != null) {
-					System.out.println("[ES] (Server received) " + line);
+					System.out.println("[ES " + hashCode() + "] Received: " + line);
 					os.println(line);
 				}
 			} catch (IOException e) {
 				System.out.println(e);
 			}
-			System.out.println("[ES] disconnected " + clientSocket.toString());
+			System.out.println("[ES " + hashCode() + "] disconnected: " + clientSocket.toString());
 		}
 	}
+
 	public static void main(String[] args) {
 		invokeMain(args, "EchoServer");
 	}