A communication control method, for a radio communication system including a radio base station, a radio terminal, and a relay station that receives a radio signal transmitted from the radio base station and relays the radio signal to the radio terminal at a transmission frequency different from a reception frequency, includes broadcasting information on one or more transmission frequencies of radio base stations or relay stations from the radio base station; and determining, by the radio terminal, whether transmission-source identification information included in the radio signals that are received before and after switching the reception frequency match, the switching being conducted based on the information broadcasted from one of the radio base station directly and via the relay station, wherein if the radio terminal determines that the transmission-source identification information matches, the radio terminal omits a terminal registering procedure after frame-synchronization with the radio communication system.