Group management method and system in interworking system of imps system and simple im system

A method and a system for managing a group in an interworking system of an IMPS system and an SIMPLE IM system are provided to enable an IMPS user to set and search a group property and information included in the SIMPLE IM system and enable an SIMPLE IM user to set and search a group property and information included in the IMPS system. A client(10) connected to one system of an IMPS(Instant Messaging and Presence Services) system and an SIMPLE IM(Session Initiation Protocol for Instant Messaging and Presence Leveraging Extensions Instant Messaging) system requests a group property search of a specific group included in the other system different from the currently-connected system. The group property search request is converted into a protocol form supported in the other system and then transmitted to the other system. The other system searches a group property of the group, and generates and transmits a group property response including the searched group property. The group property response is converted into a protocol form supported in the currently-connected system and then transmitted to the connected system. The connection system transmits the group property response to the client.