a user registers a desired mobile station at a desired hnb in a simple operation . a csg type base station restricts an access from a mobile station that has not been registered yet . the csg type base station switches in response to an operation performed by a user between a standard mode that permits an access from a mobile station that has been registered in advance while restricting an access from an unregistered mobile station and a register mode that permits an access from an unregistered mobile station which intends to be registered , receives a call at a telephone number for registration from the unregistered mobile station in the register mode , extracts mobile station information including a mobile station id of the unregistered mobile station that has placed the call , in accordance with the call received at the telephone number for registration , generates registration information by associating the mobile station information with base station information including a base station id of a host station , and transmits the registration information to a server apparatus .