A MIMO training method comprising: performing transmission sector sweeping using an initiator including a plurality of transmitting antennas, wherein the transmission sector sweeping is performed using all of the plurality of transmitting antennas, training packets are transmitted via all transmission sectors of each of the plurality of transmitting antennas, a plurality of receiving antennas included in a responder, are set in an omni-directional antenna pattern; selecting, using the responder including the plurality of receiving antennas, a determined number of antenna pairs each consisting of a transmitting antenna and a receiving antenna from among the plurality of transmitting antennas and the plurality of receiving antennas in the transmission sector sweeping, the transmitting antennas in the selected antenna pairs differing from one another, the receiving antennas in the selected antenna pairs differing from one another; selecting a set of at least one transmission sector for each of the selected antenna pairs using the responder; feeding back, to the initiator, the selected set of at least one transmission sector for each of the selected antenna pairs; performing reception sector sweeping using the initiator, wherein the plurality of transmitting antennas included in the initiator, are set in an omni-directional antenna pattern and the responder receives training packets via all reception sectors of each of the plurality of receiving antennas that forms an antenna pair with one of the plurality of transmitting antennas; selecting a set of at least one reception sector for each of the selected antenna pairs using the responder based on the received signal quality; feeding back, to the initiator, a number of the reception sectors for each of the selected antenna pairs using the responder; performing sector combination training on the selected set of the transmission sectors and the selected set of the reception sectors using the initiator based on the number of the reception sectors for each of the selected antenna pairs; and selecting, using the responder, from among the selected set of the transmission sectors and the selected set of the reception sectors, a sector pair consisting of a transmission sector and a reception sector for each of the antenna pairs using the responder. performing transmission sector sweeping using an initiator including a plurality of transmitting antennas, wherein the transmission sector sweeping is performed using all of the plurality of transmitting antennas, training packets are transmitted via all transmission sectors of each of the plurality of transmitting antennas, a plurality of receiving antennas included in a responder, are set in an omni-directional antenna pattern; selecting, using the responder including the plurality of receiving antennas, a determined number of antenna pairs each consisting of a transmitting antenna and a receiving antenna from among the plurality of transmitting antennas and the plurality of receiving antennas in the transmission sector sweeping, the transmitting antennas in the selected antenna pairs differing from one another, the receiving antennas in the selected antenna pairs differing from one another; selecting a set of at least one transmission sector for each of the selected antenna pairs using the responder; feeding back, to the initiator, the selected set of at least one transmission sector for each of the selected antenna pairs; performing reception sector sweeping using the initiator, wherein the plurality of transmitting antennas included in the initiator, are set in an omni-directional antenna pattern and the responder receives training packets via all reception sectors of each of the plurality of receiving antennas that forms an antenna pair with one of the plurality of transmitting antennas; selecting a set of at least one reception sector for each of the selected antenna pairs using the responder based on the received signal quality; feeding back, to the initiator, a number of the reception sectors for each of the selected antenna pairs using the responder; performing sector combination training on the selected set of the transmission sectors and the selected set of the reception sectors using the initiator based on the number of the reception sectors for each of the selected antenna pairs; and selecting, using the responder, from among the selected set of the transmission sectors and the selected set of the reception sectors, a sector pair consisting of a transmission sector and a reception sector for each of the antenna pairs using the responder.