A wireless power transfer apparatus comprising: a power transmitter including a plurality of coils and configured to transfer power through the plurality of coils; and a controller, wherein the controller is configured to: output an analog ping signal through the plurality of coils, calculate a variation of current flowing in each of the plurality of coils according to the output of the analog ping signal, primarily determine a position of an object in a charge region associated with the plurality of coils based on a comparison result obtained by comparing a data value of the calculated variation of the current with a preset first reference value, and calculate a quality factor of each of the plurality of coils when the object is positioned in the charge region, characterised in that the controller is further configured to determine whether the object is a wireless power reception apparatus that is a target of wireless power transfer, based on the data value of the calculated quality factor, secondarily determine the position of the object based on a comparison result obtained by comparing a data value of the calculated quality factor with a preset second reference value, output a digital ping signal through the plurality of coils when the object is determined to be the wireless power reception apparatus, when a response signal to the digital ping signal is received from the wireless power reception apparatus, calculate a signal intensity of the response signal for each of the plurality of coils, and thirdly determine the position of the object based on a comparison result obtained by comparing a data value of the calculated signal intensity with a preset third reference value. a power transmitter including a plurality of coils and configured to transfer power through the plurality of coils; and a controller, wherein the controller is configured to: output an analog ping signal through the plurality of coils, calculate a variation of current flowing in each of the plurality of coils according to the output of the analog ping signal, primarily determine a position of an object in a charge region associated with the plurality of coils based on a comparison result obtained by comparing a data value of the calculated variation of the current with a preset first reference value, and calculate a quality factor of each of the plurality of coils when the object is positioned in the charge region, characterised in that the controller is further configured to determine whether the object is a wireless power reception apparatus that is a target of wireless power transfer, based on the data value of the calculated quality factor, secondarily determine the position of the object based on a comparison result obtained by comparing a data value of the calculated quality factor with a preset second reference value, output a digital ping signal through the plurality of coils when the object is determined to be the wireless power reception apparatus, when a response signal to the digital ping signal is received from the wireless power reception apparatus, calculate a signal intensity of the response signal for each of the plurality of coils, and thirdly determine the position of the object based on a comparison result obtained by comparing a data value of the calculated signal intensity with a preset third reference value. output an analog ping signal through the plurality of coils, calculate a variation of current flowing in each of the plurality of coils according to the output of the analog ping signal, primarily determine a position of an object in a charge region associated with the plurality of coils based on a comparison result obtained by comparing a data value of the calculated variation of the current with a preset first reference value, and calculate a quality factor of each of the plurality of coils when the object is positioned in the charge region, characterised in that the controller is further configured to determine whether the object is a wireless power reception apparatus that is a target of wireless power transfer, based on the data value of the calculated quality factor, secondarily determine the position of the object based on a comparison result obtained by comparing a data value of the calculated quality factor with a preset second reference value, output a digital ping signal through the plurality of coils when the object is determined to be the wireless power reception apparatus, when a response signal to the digital ping signal is received from the wireless power reception apparatus, calculate a signal intensity of the response signal for each of the plurality of coils, and thirdly determine the position of the object based on a comparison result obtained by comparing a data value of the calculated signal intensity with a preset third reference value.