Method and apparatus for transmitting wireless power

An operation method of a wireless power transmitter, the method comprising:

• controlling the wireless power transmitter to wirelessly transmit power through a power transmitting resonator of the wireless power transmitter for charging a first power receiver;
• while transmitting the power, receiving, through a communication unit of the wireless power transmitter, a search signal from a second power receiver;
• while transmitting the power, transmitting, through the communication unit, to the second power receiver, a search response signal corresponding to the search signal;
• while transmitting the power, receiving, through the communication unit, from the second power receiver, a request join signal including at least one piece of information associated with a power requirement of the second power receiver;
• and
• based on identifying that the wireless power transmitter is capable of providing the power having an amount greater than the power requirement of the second power receiver, transmitting, through the communication unit, a charge start command to the second power receiver,
• wherein the amount of the power transmitted from the wireless power transmitter is adjusted according to power drawn by the first power receiver and the second power receiver.