A method for receiving control signaling performed by a terminal, comprising: determining a size of a downlink control information DCI format 4 associated with an uplink transmission mode; detecting, according to the determined size of the DCI format 4, DCI that corresponds to the DCI format 4, wherein the determining a size of a DCI format 4 comprises: determining an original size of a downlink control information, DCI, format 4 associated with the uplink transmission mode, wherein the uplink transmission mode is transmission mode 2 which is a multi-antenna mode; determining, according to a current downlink transmission mode, a DCI format corresponding to the current downlink transmission mode, wherein the DCI format corresponding to the current downlink transmission mode is a DCI format 2, or a DCI format 2A, or a DCI format 2B, or a DCI format 2C; comparing a size of the DCI format corresponding to the current downlink transmission mode with the original size of the DCI format 4 associated with the uplink transmission mode, and if the DCI format corresponding to the current downlink transmission mode and the DCI format 4 associated with the uplink transmission mode have the same size, a bit is appended to the DCI format 4, determining that the size of the DCI format 4 is the original size of the DCI format 4 plus an appended bit. determining a size of a downlink control information DCI format 4 associated with an uplink transmission mode; detecting, according to the determined size of the DCI format 4, DCI that corresponds to the DCI format 4, wherein the determining a size of a DCI format 4 comprises: determining an original size of a downlink control information, DCI, format 4 associated with the uplink transmission mode, wherein the uplink transmission mode is transmission mode 2 which is a multi-antenna mode; determining, according to a current downlink transmission mode, a DCI format corresponding to the current downlink transmission mode, wherein the DCI format corresponding to the current downlink transmission mode is a DCI format 2, or a DCI format 2A, or a DCI format 2B, or a DCI format 2C; comparing a size of the DCI format corresponding to the current downlink transmission mode with the original size of the DCI format 4 associated with the uplink transmission mode, and if the DCI format corresponding to the current downlink transmission mode and the DCI format 4 associated with the uplink transmission mode have the same size, a bit is appended to the DCI format 4, determining that the size of the DCI format 4 is the original size of the DCI format 4 plus an appended bit. determining an original size of a downlink control information, DCI, format 4 associated with the uplink transmission mode, wherein the uplink transmission mode is transmission mode 2 which is a multi-antenna mode; determining, according to a current downlink transmission mode, a DCI format corresponding to the current downlink transmission mode, wherein the DCI format corresponding to the current downlink transmission mode is a DCI format 2, or a DCI format 2A, or a DCI format 2B, or a DCI format 2C; comparing a size of the DCI format corresponding to the current downlink transmission mode with the original size of the DCI format 4 associated with the uplink transmission mode, and if the DCI format corresponding to the current downlink transmission mode and the DCI format 4 associated with the uplink transmission mode have the same size, a bit is appended to the DCI format 4, determining that the size of the DCI format 4 is the original size of the DCI format 4 plus an appended bit.