A data transmission indication method, comprising: sending, by an access point, orthogonal frequency division multiple access, OFDMA, physical layer signaling to a terminal, wherein the OFDMA physical layer signaling is used for indicating, to the terminal, a subchannel allocated for the terminal, so that the terminal determines the subchannel corresponding to the terminal according to the OFDMA physical layer signaling, wherein the OFDMA physical layer signaling comprises an identifier of the terminal and subchannel information corresponding to the identifier of the terminal; wherein the OFDMA physical layer signaling is specifically used for indicating, to the terminal, the subchannel that is allocated to the terminal for receiving downlink OFDMA data information, and then after the sending, by an access point, OFDMA physical layer signaling to a terminal, the method further comprises: sending, by the access point, downlink OFDMA data information on the subchannel corresponding to the terminal in an OFDMA mode, wherein the downlink OFDMA data information comprises an OFDMA preamble and OFDMA data; wherein the OFDMA physical layer signaling or the downlink OFDMA data information carries an OFDMA acknowledge, ACK, request or an OFDMA block acknowledge, BA, request, and the OFDMA ACK request or the OFDMA BA request is used for instructing the terminal to send an ACK response or a BA response to the access point in an OFDMA mode; then the OFDMA physical layer signaling or the downlink OFDMA data information is further used for indicating a subchannel that corresponds to the terminal, on which the ACK response or the BA response is sent to the access point and that is allocated for the terminal; and then after the sending, by the access point, downlink OFDMA data information on the subchannel corresponding to the terminal in an OFDMA mode, the method further comprises: receiving, by the access point, the ACK response or the BA response that is sent by the terminal on the subchannel corresponding to the terminal in the OFDMA mode. sending, by an access point, orthogonal frequency division multiple access, OFDMA, physical layer signaling to a terminal, wherein the OFDMA physical layer signaling is used for indicating, to the terminal, a subchannel allocated for the terminal, so that the terminal determines the subchannel corresponding to the terminal according to the OFDMA physical layer signaling, wherein the OFDMA physical layer signaling comprises an identifier of the terminal and subchannel information corresponding to the identifier of the terminal; wherein the OFDMA physical layer signaling is specifically used for indicating, to the terminal, the subchannel that is allocated to the terminal for receiving downlink OFDMA data information, and then after the sending, by an access point, OFDMA physical layer signaling to a terminal, the method further comprises: sending, by the access point, downlink OFDMA data information on the subchannel corresponding to the terminal in an OFDMA mode, wherein the downlink OFDMA data information comprises an OFDMA preamble and OFDMA data; wherein the OFDMA physical layer signaling or the downlink OFDMA data information carries an OFDMA acknowledge, ACK, request or an OFDMA block acknowledge, BA, request, and the OFDMA ACK request or the OFDMA BA request is used for instructing the terminal to send an ACK response or a BA response to the access point in an OFDMA mode; then the OFDMA physical layer signaling or the downlink OFDMA data information is further used for indicating a subchannel that corresponds to the terminal, on which the ACK response or the BA response is sent to the access point and that is allocated for the terminal; and then after the sending, by the access point, downlink OFDMA data information on the subchannel corresponding to the terminal in an OFDMA mode, the method further comprises: receiving, by the access point, the ACK response or the BA response that is sent by the terminal on the subchannel corresponding to the terminal in the OFDMA mode. sending, by the access point, downlink OFDMA data information on the subchannel corresponding to the terminal in an OFDMA mode, wherein the downlink OFDMA data information comprises an OFDMA preamble and OFDMA data; wherein the OFDMA physical layer signaling or the downlink OFDMA data information carries an OFDMA acknowledge, ACK, request or an OFDMA block acknowledge, BA, request, and the OFDMA ACK request or the OFDMA BA request is used for instructing the terminal to send an ACK response or a BA response to the access point in an OFDMA mode; then the OFDMA physical layer signaling or the downlink OFDMA data information is further used for indicating a subchannel that corresponds to the terminal, on which the ACK response or the BA response is sent to the access point and that is allocated for the terminal; and then after the sending, by the access point, downlink OFDMA data information on the subchannel corresponding to the terminal in an OFDMA mode, the method further comprises: receiving, by the access point, the ACK response or the BA response that is sent by the terminal on the subchannel corresponding to the terminal in the OFDMA mode.