Electronic device and method for same controlling external device

An electronic device comprising:

• a communicator implemented by a processor and configured to communicate with an external server and an external device;
• a display displaying a user interface (UI);
• and
• the processor operatively connected with the communicator and the display,
• wherein the processor is configured to:
• display a first UI corresponding to first UI data received from the external server on a screen of the display;
• control the communicator to transmit, to the external device, second UI data corresponding to the first UI;
• control the communicator to receive, from the external device, coordinates selected by a user using the external device;
• identify coordinates, which correspond to the coordinates received from the external device, on the screen of the display, based on an operation mode of the external device indicating whether the external device is in a portrait mode or a landscape mode;
• obtain additional information related to the first UI when the identified coordinates correspond to a position of the first UI displayed on the screen;
• and
• control the communicator to transmit, to the external device, the additional information and an execution command of an application using the additional information.