The radio communication system has a radio base station, a radio relay station connectable to the radio base station, and a radio terminal configured to connect to the radio base station. The radio base station notifies the radio terminal of identification information for a predetermined number of relay stations based on the number of radio relay stations that can be simultaneously connected to the radio base station. When the radio relay station is connected to the radio base station, identification information for any one of the relay stations is assigned to the radio relay station. The radio terminal performs a cell search based on the relay station identification information.