Converged ip messaging service system and method for interworking with non-converged ip messaging services

A converged IP message service providing system for interworking with a non-converged IP message service and a method thereof are provided to expand the coverage of a service. An XDM(XML Document Management) server(130) manages the presence information of one or more callees. An interworking server(140) changes the format of a converged IP message into a message format corresponding to a non-converged IP message, and then transmits the changed non-converged IP message to the callees. A converged IP messaging server(120) requests the preference information of the callees from the XDM server, determines the non-converged IP messaging service in which the interworking will be performed, and then transmits a converged IP message to the interworking server.