A wireless communications system comprises a control apparatus (AA server) for controlling subscriber information, base stations (BS1, BS2), and mobile stations (MS1, MS2), wherein the control apparatus includes: a controlling unit for controlling priorities corresponding to fixed identifiers of mobile stations; the mobile station includes: a transmitting unit for transmitting the fixed identifier of a mobile station to a target base station, to which the mobile station is connected, when being connected to the base station; and the base station includes: a receiving unit for receiving the fixed identifier of a mobile station from the mobile station; and an allotting unit for allotting an identifier in an area corresponding to the priority of the corresponding mobile station to the mobile station on the basis of the received fixed identifier and control information of the controlling unit.