Method and apparatus for keeping orders among messages of discrete media type in cpm session

A message transmission and reception method among clients via a server, the method comprising:

• generating, by a client, a message to be sent;
• allocating, by the client, sequential identification information and a cumulative size to the message to be sent;
• sending, by the client, the message to be sent to the server, the message being allocated with the sequential identification information and the cumulative size;
• receiving, by the client, a message from the server, the message including converged sequential identification information and a converged cumulative size;
• and
• outputting by the client the received message,
• wherein the sequential identification information is an identifier allowing to check orders managed by the client within a session in which transmission and reception are performed, and the cumulative size is the sum of sizes of messages, the messages sent by the client within the session,
• wherein the converged sequential identification information is an identifier allowing to check orders managed by the server, and the orders of the sequential identification information among messages sent by the same client are maintained for the converged sequential identification information,
• wherein the converged cumulative size is the sum of sizes of messages sent from the server,
• wherein the client decides whether to output the received message based upon the converged sequential identification information of the received message and the converged sequential identification information of messages received prior to the received message.

A message transmission and reception method in a method for receiving a message from a client and sending the message to other clients, the method comprising:

• receiving a message from a client, the message including sequential identification information and a cumulative size;
• allocating converged sequential identification information and a converged cumulative size to the message;
• sending a feedback to the client;
• and
• sending the message to other clients excluding the client,
• wherein the sequential identification information is an identifier allowing to check orders managed by the client, which sent the message within a session in which transmission and reception are performed, and the cumulative size is the sum of sizes of messages, the messages being sent within the session by the client, which sent the message,
• wherein the converged sequential identification information is an identifier allowing to check orders, and the orders of the sequential identification information among messages sent by the same client are maintained for the converged sequential identification information,
• wherein the converged cumulative size is the sum of sizes of messages received.