Instantaneous message temporary cluster group conversational system and method for creating and transmitting instantaneous message

The invention relates to an instant information temporary cohort conversational system and an establishing method and a transmitting method about the instant information. The system includes an interworking gateway, which is provided with a first instant information net of the global cohort information module, a second instant information net of local cohort information module. In the establishing process, the gateway is intercommunicated to transmit the inviting information and the global cohort information to the second instant information net, wherein the second instant information net records the address information belonging to the network member terminal and the temporary cohort ID in the local cohort information module, and transmits the inviting information to the member terminal of the network. The method is to transmit the received instant information by the intercommunicating gateway to the second temporary information net, while the second temporary information net transmits the instant information according to the stored member terminal information. The invention reduces the flow rate of the net and optimizes the performance of net.