A method for transmitting group downlink control information, DCI, comprising: transmitting group DCI to a user side, wherein the group DCI comprises N bit blocks, and each bit block carries indication information comprising a bitmap mapping of K HARQ processes of one user; where N, K are positive integers greater than 0, respectively; and the indication information carried in each bit block of the group DCI is configured to indicate feedback information of an HARQ process corresponding to the indication information; wherein each bit block comprises a bitmap mapping of M processes of one user, wherein each process corresponds to 1 bit in the bitmap mapping; wherein the method further comprising: setting bit values of the bitmap mapping in the bit blocks of the group DCI; wherein the step of setting bit values of the bitmap mapping in the bit blocks of the group DCI comprises: selecting P bit blocks for setting a receiving state value corresponding to the HARQ process of the user to be fed back, and defining the P bit blocks as valid bit blocks; and defining, in the case that P < N, bit blocks except the P bit blocks among the N bit blocks as invalid bit blocks, wherein values of the invalid bit blocks are set by at least one of: setting each invalid bit block to the same value as at least one valid bit block among the P bit blocks; and setting values of all invalid bit blocks to 0 or 1 or other preset values. transmitting group DCI to a user side, wherein the group DCI comprises N bit blocks, and each bit block carries indication information comprising a bitmap mapping of K HARQ processes of one user; where N, K are positive integers greater than 0, respectively; and the indication information carried in each bit block of the group DCI is configured to indicate feedback information of an HARQ process corresponding to the indication information; wherein each bit block comprises a bitmap mapping of M processes of one user, wherein each process corresponds to 1 bit in the bitmap mapping; wherein the method further comprising: setting bit values of the bitmap mapping in the bit blocks of the group DCI; wherein the step of setting bit values of the bitmap mapping in the bit blocks of the group DCI comprises: selecting P bit blocks for setting a receiving state value corresponding to the HARQ process of the user to be fed back, and defining the P bit blocks as valid bit blocks; and defining, in the case that P < N, bit blocks except the P bit blocks among the N bit blocks as invalid bit blocks, wherein values of the invalid bit blocks are set by at least one of: setting each invalid bit block to the same value as at least one valid bit block among the P bit blocks; and setting values of all invalid bit blocks to 0 or 1 or other preset values. selecting P bit blocks for setting a receiving state value corresponding to the HARQ process of the user to be fed back, and defining the P bit blocks as valid bit blocks; and defining, in the case that P < N, bit blocks except the P bit blocks among the N bit blocks as invalid bit blocks, wherein values of the invalid bit blocks are set by at least one of: setting each invalid bit block to the same value as at least one valid bit block among the P bit blocks; and setting values of all invalid bit blocks to 0 or 1 or other preset values. setting each invalid bit block to the same value as at least one valid bit block among the P bit blocks; and setting values of all invalid bit blocks to 0 or 1 or other preset values.