An electronic device is provided and includes a housing including a portion that is detachably mountable on one of a user's ears, a wireless communication circuit, a battery, a speaker, at least one sensor included in the housing, a processor electrically connected to the wireless communication circuit, the battery, the speaker, and the at least one sensor, and a memory electrically connected to the processor so that the processor can request a connection from an external device configured to be detachably mounted on another one of the user's ears, determine a portion to be output from the audio data stored in the memory based on whether a response of the external device for the request for the connection is received or at least a portion of at least one signal is received from the external device by formation of the requested connection, and output the determined portion through the speaker.