An electronic device is provided. The electronic device includes a display, a communication interface, and at least one processor operatively connected to the display and the communication interface, wherein the processor is configured to when a call is connected to a counterpart electronic device, display a call user interface (UI) including a plurality of graphic objects enabling selection of a function available during a call, in relation to a function of a first graphic object of the call UI, identify at least one external device which can be connected through the communication interface, determine the priority of the identified at least one connectable external device, and display the first graphic object including a first sub-object indicating the function of the first graphic object and a second sub-object indicating a first external device having the highest priority among the identified at least one connectable external device.