Display device and control method thereof for display main screen image and sub screen image

A control method of a display device, the control method comprising:

• based on an image output device being connected, acquiring first device information of the image output device;
• based on a content provided from an external server being selected, transmitting the first device information and second device information of the display device to the external server, the second device information corresponding to the display device;
• receiving the content from the external server, the content including a main screen image corresponding to the second device information, the content associated with a sub screen image corresponding to the first device information,
• displaying on a display of the display device the main screen image;
• transmitting the sub screen image to the image output device such that the image output device outputs the sub screen image,
• providing a user interface (UI) screen for selecting a layout arrangement from among a plurality of layout arrangements based on the first device information and the second device information,
• based on the selected layout arrangement, acquiring a guide image based on an arrangement state included in the selected layout arrangement, and
• displaying the guide image or transmitting the guide image to the image output device,
• wherein the sub screen image is located on a first side of the main screen image on the display and on a second side of the main screen image on the display.

A display device comprising:

• a communication interface;
• a display;
• and
• a processor configured to:
• based on an image output device being communicably connected to the communication interface, acquire first device information of the image output device,
• based on a content provided from an external server being selected, control the communication interface to transmit the first device information and second device information of the display device to the external server, the second device information corresponding to the display device,
• receive the content from the external server through the communication interface, the content including a main screen image corresponding to the second device information,
• process the content to determine a sub screen image,
• control the display to display the main screen image,
• control the communication interface to transmit the sub screen image to the image output device such that the image output device outputs the sub screen image,
• provide a user interface (UI) screen for selecting a layout arrangement from among a plurality of layout arrangements based on the first device information and the second device information,
• based on the selected layout arrangement acquire a guide image based on an arrangement state included in the selected layout arrangement, and
• display the guide image or transmit the guide image to the image output device,
• wherein the sub screen image is located on a first side of the main screen image on the display and on a second side of the main screen image on the display.