The present invention relates to a method and a system which transfer as well as apply the user-user application message, comprising the following steps: step S202, the sending part sends the user-user application message which is schlepped in the conversational initial agreement message to the receiving part; and the step S204, the receiving part processes the corresponding processing according to the user-user application message which is schlepped in the conversational initial agreement message. The present invention is also provides an automatic switching method, a game sharing method which can real-timely process the conversation and a method which transfers the user-user application message by the signaling adapting entities. The present invention can flexibly describe varied data information and to realize the transmission as well as the processing of the newly increased specific user-user information.