An electronic device for wireless power transmission to external electronic devices, comprising: a plurality of coils; a first power generation circuit electrically connected to at least one of the plurality of coils; a second power generation circuit electrically connected to at least one of the plurality of coils; and a control circuit, wherein the control circuit is configured to: when approach of a second external electronic device is detected by using at least part of the plurality of coils while first power is provided to a first external electronic device by using a first frequency via the first power generation circuit, for providing the second external electronic device with second power, set a frequency of the second power generation circuit to a second frequency different from the first frequency, and set a first voltage of the second power generation circuit to a second voltage which corresponds to the second frequency, wherein the second voltage is a voltage compensating for a difference between first power provided by using the first frequency and second power provided by using the second frequency, when it is required to provide power of a same magnitude to the first and second external electronic devices. a plurality of coils; a first power generation circuit electrically connected to at least one of the plurality of coils; a second power generation circuit electrically connected to at least one of the plurality of coils; and a control circuit, wherein the control circuit is configured to: when approach of a second external electronic device is detected by using at least part of the plurality of coils while first power is provided to a first external electronic device by using a first frequency via the first power generation circuit, for providing the second external electronic device with second power, set a frequency of the second power generation circuit to a second frequency different from the first frequency, and set a first voltage of the second power generation circuit to a second voltage which corresponds to the second frequency, wherein the second voltage is a voltage compensating for a difference between first power provided by using the first frequency and second power provided by using the second frequency, when it is required to provide power of a same magnitude to the first and second external electronic devices. when approach of a second external electronic device is detected by using at least part of the plurality of coils while first power is provided to a first external electronic device by using a first frequency via the first power generation circuit, for providing the second external electronic device with second power, set a frequency of the second power generation circuit to a second frequency different from the first frequency, and set a first voltage of the second power generation circuit to a second voltage which corresponds to the second frequency, wherein the second voltage is a voltage compensating for a difference between first power provided by using the first frequency and second power provided by using the second frequency, when it is required to provide power of a same magnitude to the first and second external electronic devices.