A relay method is disclosed in a cellular communication system including an access node for providing an access service using resources of a licensed band to a particular terminal among a plurality of terminals with a partial licensed band of the full frequency spectrum, and a relay station for relaying communication between the terminal and an access node. The relay method includes performing base station-led resource allocation on a licensed band for a terminal and a relay station located in a service area of the base station, and performing relay station-led resource allocation on the licensed band and an unlicensed band for a terminal located in a service area of the relay station.