System and method for providing a converged messaging service

A system and a method for providing a converged messaging service are provided to present a converged messaging service to integrate various messaging services, such as IMS(Instant Message Service), SMS(Short Message Service) and MMS(Multimedia Message Service), to define a network element to store and manage messaging data efficiently in order to provide the converged messaging service, and to offer an interface to operate the network element. A system for providing a converged messaging service comprises a transmitting-side client(200), a converged messaging server(270), and a receiving-side SIP(Session Initiation Protocol)/IP(Internet Protocol) core(220). The transmitting-side client transmits a converged messaging service-type message containing a converged messaging service identification tag to the converged messaging server. The converged messaging server forwards the message to an associated receiving-side network. The receiving-side SIP/IP core receives the message and confirms whether the receiving client of the message supports an IMS(IP Multimedia Subsystem) service. If so, the SIP/IP core converts the converged messaging service identification tag of the received message into an identification tag corresponding to a message service the receiving client supports. Then the SIP/IP core transmits the message containing the converted identification tag to the receiving client according to the procedures of the IMS service.