The present invention discloses cooperative application program work and decision system based on network and their realizing method, and belongs to the fields of application program and computer network. The present invention realizes supports the cooperative network work, may be used in improving available application software conveniently, and has excellent versatility and flexibility. The present invention includes one main server with server application program installed and several cooperative terminals with client application program and client end deputy software. The main server controls the synchronous or asynchronous cooperative operation and request information of the cooperative terminals via network and may be also used as one cooperative terminal.