To provide a control station device capable of reducing a control load when executing the diversity handover, and also, capable of surely connecting a mobile station with a base station which can satisfy prescribed communication quality.

A moving speed detector 104 detects the moving speed of the mobile station by a received signal. An HO control parameter determining part 105 variably sets a handover control parameter on the basis of the moving speed of a terminal device. A connection determining part 106 notifies the mobile station by selecting a base station device, to which the mobile station is connected, on the basis of the handover control parameter set by the HO control parameter determining part 105 and a Measurement Report informed from the mobile station in prescribed periods.