A base station and a terminal that perform communication using an unlicensed band may divide a bandwidth part into a plurality of subbands and may perform a channel access procedure for the respective subbands. The terminal receives, from the base station, configuration information via radio resource control (RRC) signaling. The terminal identifies whether information on a guardband is included in the configuration information. The base station transmits control information including bitmap information indicating an available resource block (RB) set among RB sets, wherein the RB sets are determined based on the information on the guardband based on the information on the guardband is included in the configuration information. The base station also transmits data based on the bitmap information.