A communication method supporting carrier aggregation, wherein each carrier corresponds to a corresponding hybrid automatic repeat request HARQ entity, and each HARQ entity manages a respective HARQ process, the method comprising: determining, by a terminal device, that a first transport block TB is related to at least one TB, the first TB being transmitted in a first hybrid automatic repeat request HARQ process managed by a first HARQ entity, the at least one TB being transmitted in at least one HARQ process managed by at least one HARQ entity, the at least one HARQ process corresponding to the at least one HARQ entity one to one, the at least one TB corresponding to the at least one HARQ process one to one; and performing, by the terminal device, at least one of: feeding back negative acknowledgement, NACK, to the network device only when reception of both the first TB and the at least one TB fails and feeding back acknowledgement, ACK, as long as reception of one or at least a part of the first TB and the at least one TB succeeds; and combination processing of the first TB and the at least one TB, wherein determining by the terminal device that a first transport block is related to the at least one TB comprises: determining that TBs with the same medium access control, MAC, protocol data unit, PDU, structure and the same data are related TBs; or determining that TBs with the same transport block size and the same MAC PDU structure are related TBs; or determining that TBs with the same transport block size, the same MAC PDU structure and the same included data are related TBs, wherein the combination processing of the first TB and the at least one TB comprises: decoding, by the terminal device, the first TB and the at least one TB at a physical layer; and performing, by the terminal device, combination processing regarding correctly decoded portions of the first TB and the at least one TB. determining, by a terminal device, that a first transport block TB is related to at least one TB, the first TB being transmitted in a first hybrid automatic repeat request HARQ process managed by a first HARQ entity, the at least one TB being transmitted in at least one HARQ process managed by at least one HARQ entity, the at least one HARQ process corresponding to the at least one HARQ entity one to one, the at least one TB corresponding to the at least one HARQ process one to one; and performing, by the terminal device, at least one of: feeding back negative acknowledgement, NACK, to the network device only when reception of both the first TB and the at least one TB fails and feeding back acknowledgement, ACK, as long as reception of one or at least a part of the first TB and the at least one TB succeeds; and combination processing of the first TB and the at least one TB, wherein determining by the terminal device that a first transport block is related to the at least one TB comprises: determining that TBs with the same medium access control, MAC, protocol data unit, PDU, structure and the same data are related TBs; or determining that TBs with the same transport block size and the same MAC PDU structure are related TBs; or determining that TBs with the same transport block size, the same MAC PDU structure and the same included data are related TBs, wherein the combination processing of the first TB and the at least one TB comprises: decoding, by the terminal device, the first TB and the at least one TB at a physical layer; and performing, by the terminal device, combination processing regarding correctly decoded portions of the first TB and the at least one TB. feeding back negative acknowledgement, NACK, to the network device only when reception of both the first TB and the at least one TB fails and feeding back acknowledgement, ACK, as long as reception of one or at least a part of the first TB and the at least one TB succeeds; and combination processing of the first TB and the at least one TB, wherein determining by the terminal device that a first transport block is related to the at least one TB comprises: determining that TBs with the same medium access control, MAC, protocol data unit, PDU, structure and the same data are related TBs; or determining that TBs with the same transport block size and the same MAC PDU structure are related TBs; or determining that TBs with the same transport block size, the same MAC PDU structure and the same included data are related TBs, wherein the combination processing of the first TB and the at least one TB comprises: decoding, by the terminal device, the first TB and the at least one TB at a physical layer; and performing, by the terminal device, combination processing regarding correctly decoded portions of the first TB and the at least one TB. determining that TBs with the same medium access control, MAC, protocol data unit, PDU, structure and the same data are related TBs; or determining that TBs with the same transport block size and the same MAC PDU structure are related TBs; or determining that TBs with the same transport block size, the same MAC PDU structure and the same included data are related TBs, wherein the combination processing of the first TB and the at least one TB comprises: decoding, by the terminal device, the first TB and the at least one TB at a physical layer; and performing, by the terminal device, combination processing regarding correctly decoded portions of the first TB and the at least one TB. decoding, by the terminal device, the first TB and the at least one TB at a physical layer; and performing, by the terminal device, combination processing regarding correctly decoded portions of the first TB and the at least one TB.