The present invention utilizes a communication method including acquiring, with a radio base station, reception quality of the received signal received via no relay station from a radio base station measured with a radio terminal and reception quality received via a relay station from the radio base station and selecting the route for the radio terminal on the basis of both reception qualities acquired. Moreover, the present invention utilizes a relay station including a receiving unit for received signal in the transmission timing for transmission from the radio terminal notified from the radio base station, a measuring unit for measuring reception quality of the received signal obtained by the reception, and a transmitting unit for transmitting the result of measurement to the radio base station.