A display device comprising: a display; a short-range communication unit configured to perform a wireless communication with an external device; a memory configured to store information on the external device that performs a screen mirroring function with the display device and information on content provided through the external device; and a controller configured to control the short-range communication unit and the display, wherein the controller is further configured to: display an external input list including a plurality of external input items, receive a first request to select an external input item for screen mirroring from the plurality of external input items, and display a mirroring item including at least one of information on the external device and information on content provided through the external device according to the first request, characterized in that the stored information on content includes an access path for obtaining the content, if content requested by the display device is content provided from a content provider instead of content stored in the external device, and the controller is further configured to: receive a second request for selecting a mirroring item corresponding to the first request, and if the external device corresponding to the selected mirroring item is not found in response to the second request, display a message that the external device corresponding to the selected mirroring item is not found, and if the controller is in a state that an access path of the corresponding content is stored in the memory, display the access path for obtaining the content. a display; a short-range communication unit configured to perform a wireless communication with an external device; a memory configured to store information on the external device that performs a screen mirroring function with the display device and information on content provided through the external device; and a controller configured to control the short-range communication unit and the display, wherein the controller is further configured to: display an external input list including a plurality of external input items, receive a first request to select an external input item for screen mirroring from the plurality of external input items, and display a mirroring item including at least one of information on the external device and information on content provided through the external device according to the first request, display an external input list including a plurality of external input items, receive a first request to select an external input item for screen mirroring from the plurality of external input items, and display a mirroring item including at least one of information on the external device and information on content provided through the external device according to the first request, characterized in that the stored information on content includes an access path for obtaining the content, if content requested by the display device is content provided from a content provider instead of content stored in the external device, and the controller is further configured to: receive a second request for selecting a mirroring item corresponding to the first request, and if the external device corresponding to the selected mirroring item is not found in response to the second request, display a message that the external device corresponding to the selected mirroring item is not found, receive a second request for selecting a mirroring item corresponding to the first request, and if the external device corresponding to the selected mirroring item is not found in response to the second request, display a message that the external device corresponding to the selected mirroring item is not found,