A wireless power transmitter comprising: first to N th transmission coils (111, 112, 113) configured to wirelessly transmit an alternating current power signal, wherein N is a positive integer; and a controller configured to transmit a first sensing signal to a wireless power receiver via the first to N th transmission coils (111, 112, 113) and, upon receiving a response signal from the wireless power receiver including a first signal strength indicator corresponding to the first sensing signal, identify the transmission coils (111, 112, 113) that have received the first signal strength indicator; subsequently adjust sequentially a transmission order for a second sensing signal to be transmitted via the first to N th transmission coils (111, 112, 113) based on a signal strength of the first signal strength indicator; receive the response signal including a second signal strength indicator corresponding to the second sensing signal; identify a transmission coil among the transmission coils (111, 112, 113) that have received the second signal strength indicator; and transmit power through the identified transmission coil, wherein the first sensing signal and the second sensing signal (117, 127) are digital ping signals defined in a WPC standard or a PMA standard, wherein the first sensing signal and the second sensing signal (117, 127) have a difference in at least one of an output voltage strength, a transmission period, or a transmission time, and when no response signal is received, the transmitter transitions to a selection phase (210; S202), characterized in that only when the first and the second transmission coil (111, 112) of the first to N lh transmission coils (111, 112, 113) have been identified to have received the first and the second signal strength indicators (116 and 126), the wireless power transmitter is configured to select the most well-aligned transmission coil based on the second signal strength indicator received by each of the first and the second transmission coil (111, 112) of the first to N th transmission coils (111, 112, 113), and to perform wireless charging using the selected transmission coil, and that the controller is configured to - adjust the transmission order for the second sensing signal based on the signal strength of the received first signal strength indicator so as to prevent a current value of the wireless power receiver from falling below a predetermined reference value during a reset time (T reset) for resetting the wireless power receiver, and also - adjust the transmission order for the second sensing signal based on a signal strength of the received first signal strength indicator when the reset time (T reset) for resetting the wireless power receiver is set to be longer than a predetermined time. first to N th transmission coils (111, 112, 113) configured to wirelessly transmit an alternating current power signal, wherein N is a positive integer; and a controller configured to transmit a first sensing signal to a wireless power receiver via the first to N th transmission coils (111, 112, 113) and, upon receiving a response signal from the wireless power receiver including a first signal strength indicator corresponding to the first sensing signal, identify the transmission coils (111, 112, 113) that have received the first signal strength indicator; subsequently adjust sequentially a transmission order for a second sensing signal to be transmitted via the first to N th transmission coils (111, 112, 113) based on a signal strength of the first signal strength indicator; receive the response signal including a second signal strength indicator corresponding to the second sensing signal; identify a transmission coil among the transmission coils (111, 112, 113) that have received the second signal strength indicator; and transmit power through the identified transmission coil, wherein the first sensing signal and the second sensing signal (117, 127) are digital ping signals defined in a WPC standard or a PMA standard, wherein the first sensing signal and the second sensing signal (117, 127) have a difference in at least one of an output voltage strength, a transmission period, or a transmission time, and when no response signal is received, the transmitter transitions to a selection phase (210; S202), characterized in that only when the first and the second transmission coil (111, 112) of the first to N lh transmission coils (111, 112, 113) have been identified to have received the first and the second signal strength indicators (116 and 126), the wireless power transmitter is configured to select the most well-aligned transmission coil based on the second signal strength indicator received by each of the first and the second transmission coil (111, 112) of the first to N th transmission coils (111, 112, 113), and to perform wireless charging using the selected transmission coil, and that the controller is configured to - adjust the transmission order for the second sensing signal based on the signal strength of the received first signal strength indicator so as to prevent a current value of the wireless power receiver from falling below a predetermined reference value during a reset time (T reset) for resetting the wireless power receiver, and also - adjust the transmission order for the second sensing signal based on a signal strength of the received first signal strength indicator when the reset time (T reset) for resetting the wireless power receiver is set to be longer than a predetermined time.