A wireless power transmission device (400, 600, 700) 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 (400, 600, 700) using the wireless charging circuit while a power is transmitted via 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, first charging information comprising information relating to a voltage, a current or a power that is supportable by the wireless power transmission device (400, 600, 700), receive, from the wireless power reception device, a second signal including second charging information relating to the voltage, the current or the power using the wireless charging circuit, based at least in part on the second signal, control the wireless charging circuit to change a voltage, a current or a power to be applied to the transmission coil. 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 (400, 600, 700) using the wireless charging circuit while a power is transmitted via 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, first charging information comprising information relating to a voltage, a current or a power that is supportable by the wireless power transmission device (400, 600, 700), receive, from the wireless power reception device, a second signal including second charging information relating to the voltage, the current or the power using the wireless charging circuit, based at least in part on the second signal, control the wireless charging circuit to change a voltage, a current or a power to be applied to the transmission coil. receive, from a wireless power reception device, a first signal to request wireless charging information related to the wireless power transmission device (400, 600, 700) using the wireless charging circuit while a power is transmitted via 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, first charging information comprising information relating to a voltage, a current or a power that is supportable by the wireless power transmission device (400, 600, 700), receive, from the wireless power reception device, a second signal including second charging information relating to the voltage, the current or the power using the wireless charging circuit, based at least in part on the second signal, control the wireless charging circuit to change a voltage, a current or a power to be applied to the transmission coil.