To shorten a time required for a terminal unit to retrieve a handover destination base station apparatus.

A measurement portion 120 measures interference power to each channel. A first selecting portion 122 selects a channel with a smaller interference power as a channel candidate, based on the measured interference power. A second selecting portion 124 periodically selects a channel close to a channel with a larger interference power among the selected channel candidates. After a control signal including information about the base station apparatus is arranged in the channel selected periodically, a control portion 107 controls a wireless portion 101 and the like to broadcast the arranged control signal. The wireless portion 101 and the like perform communication with a terminal unit which receives the broadcast control signal.