A wireless power transmission device comprising: a wireless charging circuit comprising a transmission coil ; and one or more processors (480; 620) operatively connected with the wireless charging circuit, wherein the one or more processors are configured to: receive, from a wireless power reception device , a first signal to request wireless charging information related to the wireless power transmission device using the wireless charging circuit while applying a first voltage to the transmission coil for wirelessly charging the wireless power reception device ; in response to the receiving of the first signal, transmit, through the wireless charging circuit to the wireless power reception device , information relating to at least one voltage that is supportable by the wireless power transmission device , as at least part of the wireless charging information; receive, from the wireless power reception device , a second signal including information relating to a second voltage of the at least one voltage using the wireless charging circuit ; based at least in part on the receiving of the second signal, change a voltage to be applied to the transmission coil from the first voltage to the second voltage; and control the wireless charging circuit to apply, to the transmission coil , the second voltage for transmitting wireless power, and wherein the second voltage is greater than the first voltage. a wireless charging circuit comprising a transmission coil ; and one or more processors (480; 620) operatively connected with the wireless charging circuit, wherein the one or more processors are configured to: receive, from a wireless power reception device , a first signal to request wireless charging information related to the wireless power transmission device using the wireless charging circuit while applying a first voltage to the transmission coil for wirelessly charging the wireless power reception device ; in response to the receiving of the first signal, transmit, through the wireless charging circuit to the wireless power reception device , information relating to at least one voltage that is supportable by the wireless power transmission device , as at least part of the wireless charging information; receive, from the wireless power reception device , a second signal including information relating to a second voltage of the at least one voltage using the wireless charging circuit ; based at least in part on the receiving of the second signal, change a voltage to be applied to the transmission coil from the first voltage to the second voltage; and control the wireless charging circuit to apply, to the transmission coil , the second voltage for transmitting wireless power, and wherein the second voltage is greater than the first voltage. receive, from a wireless power reception device , a first signal to request wireless charging information related to the wireless power transmission device using the wireless charging circuit while applying a first voltage to the transmission coil for wirelessly charging the wireless power reception device ; in response to the receiving of the first signal, transmit, through the wireless charging circuit to the wireless power reception device , information relating to at least one voltage that is supportable by the wireless power transmission device , as at least part of the wireless charging information; receive, from the wireless power reception device , a second signal including information relating to a second voltage of the at least one voltage using the wireless charging circuit ; based at least in part on the receiving of the second signal, change a voltage to be applied to the transmission coil from the first voltage to the second voltage; and control the wireless charging circuit to apply, to the transmission coil , the second voltage for transmitting wireless power, and wherein the second voltage is greater than the first voltage. <EOS>