a signal transmission phase of transmitting a signal including an FOD status packet to a wireless power transmitter;

a power reception phase of receiving a first power from the wireless power transmitter when a NAK response indicating that a foreign object is present in the charging area of the wireless power transmitter is received from the wireless power transmitter, or receiving a second power from the wireless power transmitter when an ACK response indicating that the foreign object is not present in the charging area of the wireless power transmitter is received from the wireless power transmitter, in response to the FOD status packet;

a phase of transmitting a reception power packet including information on reception power intensity to the wireless power transmitter; and

a phase of receiving a signal including information on a result of determining whether the foreign object is present in the charging area from the wireless power transmitter using information measured or calculated by the wireless power transmitter in response to the reception power packet, while receiving the second power,

wherein the FOD status packet includes a first FOD status packet and a second FOD status packet;

wherein the first FOD status packet includes one of a reference quality factor or a reference peak frequency; and

wherein the second FOD status packet includes the other of the reference quality factor and the reference peak frequency that is different from the first FOD status packet.