Disclosed herein is a terminal configured to receive information about one or more periodic uplink resources for transmission of HARQ-ACK information for multicast data, monitor a PDCCH in a search space for multicast configured on a specific downlink frequency resource, and detect DCI having a CRC scrambled with a G-RNTI. On a basis that the DCI indicates a specific index, and at least one of the one or more periodic uplink resources is associated with the specific index indicated by the DCI, the terminal may transmit an activation confirmation message to activate the at least one periodic uplink resource associated with the specific index.