Disclosed are a subscriber information management system and a method for a mobile communication service system for managing subscriber information. System comprises a subscriber information management system for a mobile communication service system that a wire terminal and a wireless terminal respectively connected with an integrating and managing server and provides at least one portal service from the integrating and managing server, the system comprising: a subscriber information management unit, wherein the subscriber information management unit is included in the integrating and managing server, and links subscriber information transmitted from the wireless terminal with subscriber information transmitted from the wire terminal using a predetermined key value.