1. An information synchronization system, comprising: a plurality of mobile communication devices storing individually incomplete user information; at least one mobile service interface adapted to receive and transmit said stored user information for processing; and at least one processor adapted to arrange said transmitted user information to allow each of said plurality of mobile communication devices to complete its user information without data duplication, and transmit said arranged user information to each of said plurality of mobile communication devices by way of said at least one mobile service interface for storing therein.