a communication module comprising communication circuitry;

a power transmission circuit configured to transmit wireless power; and

a processor,

wherein the processor is configured to:

establish a communication connection with a wireless power receiver using the communication module,

control the communication module to transmit information about a first period to the wireless power receiver via the communication connection,

control the power transmission circuit to transmit first power of a first frequency and a first magnitude to an outside,

control the communication module to receive, from the wireless power receiver via the communication connection, information about a second frequency of second power received at the wireless power receiver,

based on the first frequency being different from the second frequency, control the communication module to release the communication connection, and

based on the first frequency corresponding to the second frequency, control the power transmission circuit to transmit third power of a magnitude different from the first magnitude of the first power to the outside during the first period.