A relay station in a communication system comprises: a communication unit which initiates a session of the relay station, after an initial communication link is established among each of a relay station, a base station and a switching station, by acquiring a cell list indicative of one or more candidates of donor base stations from a maintenance management node and performing initial connection procedures for establishing a communication link with respect to any donor base station in the cell list and a switching station connected to the donor base station; a storage unit which stores the cell list; and a reconnection control unit, which, when a wireless link with the donor base station is broken, controls the communication unit so as to select a donor base station satisfying a predetermined criteria from the cell list stored in the storage unit and establish a communication link with respect to the selected donor base station and a switching station connected to the donor base station.