An electronic device, according to various example embodiments of the present disclosure, may include: a housing; a display disposed to be exposed through one surface of the housing; at least one fastener formed on at least one surface of the housing and configured to be attached to, and detached from, an external electronic device; a communication circuit disposed inside the housing and configured to establish a communication connection with the external electronic device; and a processor disposed inside the housing, wherein the processor is configured to: determine whether the electronic device is connected with the external electronic device through the communication circuit; determine the type of the connected external electronic device when the electronic device is connected with the external electronic device; display, on the display, at least one preset function corresponding to the determined type of the external electronic device among a plurality of functions of the electronic device; and provide a function selected from the at least one function displayed on the display.