A service system for providing a service using a social group community function and a method therefor are provided. The method includes transmitting information, on a list of a chat room associated with a content providing service among a plurality of chat rooms managed in the SNS, to a server which provides the content providing service according to a request from the server which provides the content providing service a user of the SNS accesses, receiving information about a chat room selected by the user on the list of the chat room and link information from the server, and providing the link information to participants of the selected chat room through the selected chat room.