A storage unit (191) stores local coverage information that is information relating to wireless stations present within the coverage of a local station, and downlink coverage information that is information relating to wireless stations present within the coverage of a downlink station. A reception unit (192) receives a downlink message. When the downlink message has been received, a timer unit (120) starts a downlink timer in which a downlink transmission cycle determined on the basis of the local coverage information and the downlink coverage information is set. A transmission unit (193) transmits a message including the local coverage information when the downlink timer has expired.