Abstract: A method for operating a display device according to an embodiment includes acquiring an image of a plurality of users, recognizing a plurality of faces respectively corresponding to the plurality of users from the acquired image, checking a viewing state of media content for each user, when the plurality of users respectively corresponding to the plurality of recognized faces are registered users, acquiring viewing information corresponding to at least one of the plurality of registered users of which the viewing state has been changed from a viewing maintaining state in which the media content is viewed to a not-viewing state in which the media content is not viewed, and performing a re-viewing function on the basis of the acquired viewing information when a face of the user of which the viewing state has been changed is re-recognized.

Abstract: A method of controlling a display device, and which includes obtaining, via camera of the display device, a user's image; recognizing, via a controller of the display device, a user's hand gesture from the obtained user's image; and when the recognized user's hand gesture does not match a pre-stored gesture, displaying, via a display of the display device, a function guide including different hand gestures different than the recognized user's hand gesture for guiding a user's selection for performing a function of the display device.

Abstract: A method for operating a display device according to an embodiment includes acquiring an image of a plurality of users, recognizing a plurality of faces respectively corresponding to the plurality of users from the acquired image, checking a viewing state of media content for each user, when the plurality of users respectively corresponding to the plurality of recognized faces are registered users, acquiring viewing information corresponding to at least one of the plurality of registered users of which the viewing state has been changed from a viewing maintaining state in which the media content is viewed to a not-viewing state in which the media content is not viewed, and performing a re-viewing function on the basis of the acquired viewing information when a face of the user of which the viewing state has been changed is re-recognized.

Abstract: A method of controlling a display device, and which includes obtaining, via camera of the display device, a user's image; recognizing, via a controller of the display device, a user's hand gesture from the obtained user's image; and when the recognized user's hand gesture does not match a pre-stored gesture, displaying, via a display of the display device, a function guide including different hand gestures different than the recognized user's hand gesture for guiding a user's selection for performing a function of the display device.