An operation method of a terminal in a communication system may comprise: receiving, from a base station, a higher layer message including first configuration information of a first HARQ process group and second configuration information of a second HARQ process group; receiving, from the base station, control information including an RV field including first information indicating one HARQ process group used for communication between the terminal and the base station among the first HARQ process group and the second HARQ process group, a HPN field including second information indicating a number of a HARQ process belonging to the one HARQ process group indicated by the first information, and resource allocation information; receiving data from the base station based on the resource allocation information; and determining whether to transmit a HARQ feedback for the data according to the first information included in the control information.