According to an embodiment, an electronic device comprises a metal housing forming at least part of an outer surface of the electronic device, at least part of the metal housing used as an antenna configured to communicate a signal for first communication, a radio frequency (RF) transceiver electrically connected with the antenna, an RF receiver configured to process a signal for second communication, at least one processor, and a memory, wherein the at least one processor is configured to detect insertion of a connection part of an external antenna for the second communication into a connector electrically connected with the RF receiver and output a control signal for adjusting a resonance frequency of the antenna based on the detection of insertion.