PURPOSE: A method for protecting the message delivery order of a discrete media type in a CPM(Converged IP Messaging) session preventing the confusion of a user is provided to generate a message of a discrete media type in the CPM session.;CONSTITUTION: In case a sequence number is included within a received message, a client compares the maximum value and sequence number among the sequence number of the received message(S220, S230). In case the sequence number is bigger than the maximum value, a client inspects the sequence number is the next sequence number approval of the existing incoming message(S240). In case the sequence number is the next sequence number of the existing incoming message, the client transfers the message to the user(S250).;COPYRIGHT KIPO 2011
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