A relay apparatus compresses an information amount of channel quality information notified from a plurality of terminal apparatuses to notify a control station apparatus, and thereby improves spectral efficiency. The relay apparatus 400, which is applied to a communication system in which a control station apparatus and a terminal apparatus perform wireless communications using a plurality of sub-channels and relays the communications between the control station apparatus and the terminal apparatus, has a receiving section 402 that receives channel quality information indicative of channel quality of sub-channels from the terminal apparatus, a compressing section 405 that compresses an information amount of the received channel quality information and that generates notification information to notify the control station apparatus, and a transmitting section 406 that transmits the generated notification information to the control station apparatus.