A communication method and system are provided for converging a 5G communication system with IoT technology. A method by a terminal includes receiving information on a number of CBGs of a TB via higher layer signaling; identifying the number of the CBGs of the TB based on the information; receiving DCI scheduling downlink data transmission, wherein the DCI includes an NDI and a CBG indicator; receiving downlink data corresponding to the TB; in case of identifying that the DCI is associated with an initial transmission of the TB based on the NDI, identifying the CBGs of the TB; in case of identifying that the DCI is associated with a retransmission of the TB based on the NDI, identifying one or more CBGs corresponding to a bit value of 1 included in the CBG indicator, the bit value 1 indicating corresponding CBG of the TB is present in the downlink data transmission; and decoding the identified CBGs.