Display device and content sharing method for sharing content with external display device

A display device comprising:

• a display;
• a communication interface;
• and
• a controller configured to:
• receive a command from a remote control device;
• cause the display to display a screen selection interface in response to the command, wherein the screen selection interface identifies a plurality of external display devices that are individually selectable by a user,
• receive a selection of a selected external display device, from among the plurality of external display devices, for which content is to be loaded from for display at the display device,
• determine whether the selected external display device does provide, or does not provide, a screen loading function,
• determine whether the selected external display device is powered on or is powered off,
• cause the display to display a screen loading failure pop-up when the selected external display device does provide the screen loading function and when the selected external display device is determined to be powered on,
• transmit a remote power-on command and a screen sharing command to the selected external display device through the communication interface, when the selected external display device is determined to be powered off,
• receive the content from the selected external display device through the communication interface, in response to the screen sharing command, and
• cause the display to display the received content.