capacity multimedia messaging service provided according to the embodiments of the present invention propose a peer cluster solution for a horizontal capacity extension of a large capacity multimedia messaging service and have the following advantages firstly the relay and the server are integrated to constitute an independent mmsc node so that processing of contents of the same multimedia message is accomplished on the same node in the system thereby reducing cross accesses between nodes improving the efficiency of transferring the message and hence increasing the processing power of the multimedia messaging service system further all mmsc nodes are numbered uniformly and number information is made correspond to the port number of the server so that the message distribution device can send a message retrieval request directly to the mmsc node processing the session and the relay can deliver the multimedia message directly to the corresponding server thereby improving the efficiency of transferring the message reducing greatly the demand for a transmission speed of network devices and increasing the processing power of the multimedia messaging service system secondly each mmsc node can enable independently i o reading and writing of a multimedia message thereby optimizing the storage architecture of the multimedia message and avoiding the problem of limited service processing of the multimedia messaging service system.