An electronic device according to various embodiments of the present disclosure may include a communication module configured to communicate wirelessly with an external device; an ear jack configured to include at least one ear jack terminal; an audio processing unit configured to process an audio signal; and a control unit configured to: detect a coupling with the external device through the ear jack, determine whether the electronic device is in a power transmission mode, control the audio processing unit to generate an ear jack signal when the electronic device is in a power transmission mode, output the ear jack signal by amplifying the ear jack signal so that power is supplied to the coupled external device, and to output the audio signal to the ear jack terminal when the electronic device is not in a power transmission mode.