Area quality information is collected from a user terminal without applying an excessive traffic load to a system. Operation maintenance center (OMC) (307) transmits a confirmation signal to a wireless access terminal AT (305) through a base transceiver station BTS (301), and receives a wireless access terminal identifier from the wireless access terminal. The OMC stores the received identifier of the wireless access terminal correspondingly to an identifier of the base transceiver station. In a case where a performance value acquired from the BTS is a previously determined limit value or less, the OMC reads the identifier of the wireless access terminal corresponding to the identifier of the base transceiver station. The OMC transmits an acquisition instruction of information to the wireless access terminal. The OMC acquires area quality information including position information of the wireless access terminal and radio waves information between the wireless access terminal at the position and the base transceiver station.