An electronic device is provided. The electronic device includes housing, a touchscreen display, a wireless communication circuit, a connector, and a processor electrically connected to the touchscreen display, the wireless communication circuit, and the connector. The processor is configured to connect to an external display device via the wireless communication circuit or the connector, to display a graphical user interface corresponding to a screen, which the external display device outputs, in at least part of a region of the touchscreen display, to display at least part of a region of the graphical user interface in a black background, and to convert first coordinate information of a user input, which is received with respect to at least one region of the graphical user interface, to second coordinate information corresponding to the external display device to transmit the second coordinate information to the external display device.