A radio communication system, in a base station apparatus, previously registers neighboring base station information as a part of base station management information, and informs the terminal station of the neighboring base station information. The base station apparatus includes a handover processing unit for detecting that the terminal station has implemented handover that does not pass through a handover preparation phase from an other base station that has not been registered in a list of the neighboring base station information; and a management unit for dynamically additionally registering the other base station in the list of the neighboring base station information when implementation of the handover has been detected by the handover processing unit.