DISPLAY DEVICE AND CONTROL METHOD THEREOF

A display device includes: 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, the content being associated with a sub screen image corresponding to the first device information, control the display to display the main screen image, and 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.