A method of controlling a display device, the method comprising: obtaining, via a 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 if 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 (320a-320d) different than the recognized user's hand gesture for guiding a user's selection for performing a function of the display device, wherein the different hand gestures (320a-320d) include a plurality of similar hand gestures representing a gesture pattern similar to the recognized user's hand gesture, the function guide comprises: an image of the recognized user's hand gesture; and a plurality of images of the different hand gestures (320a-320d), wherein the function of the display device represents a function related to a media content displayed on the display of the display device, characterized in that each of the images of the different hand gestures (320a-320d) is disposed around the image of the recognized user's hand gesture in order to allow a user to select easily one among the images of the different hand gestures, the method further comprises: recognizing that a user's hand is moved toward a direction where one image among the plurality of images of the different hand gestures (320a-320d) is disposed, selecting the image of a different hand gesture corresponding to the recognized direction, and performing the function of the display device corresponding to the selected image of the different hand gesture. obtaining, via a 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 if 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 (320a-320d) different than the recognized user's hand gesture for guiding a user's selection for performing a function of the display device, wherein the different hand gestures (320a-320d) include a plurality of similar hand gestures representing a gesture pattern similar to the recognized user's hand gesture, the function guide comprises: an image of the recognized user's hand gesture; and a plurality of images of the different hand gestures (320a-320d), wherein the function of the display device represents a function related to a media content displayed on the display of the display device, characterized in that each of the images of the different hand gestures (320a-320d) is disposed around the image of the recognized user's hand gesture in order to allow a user to select easily one among the images of the different hand gestures, the method further comprises: recognizing that a user's hand is moved toward a direction where one image among the plurality of images of the different hand gestures (320a-320d) is disposed, selecting the image of a different hand gesture corresponding to the recognized direction, and performing the function of the display device corresponding to the selected image of the different hand gesture. an image of the recognized user's hand gesture; and a plurality of images of the different hand gestures (320a-320d), wherein the function of the display device represents a function related to a media content displayed on the display of the display device, characterized in that each of the images of the different hand gestures (320a-320d) is disposed around the image of the recognized user's hand gesture in order to allow a user to select easily one among the images of the different hand gestures, the method further comprises: recognizing that a user's hand is moved toward a direction where one image among the plurality of images of the different hand gestures (320a-320d) is disposed, selecting the image of a different hand gesture corresponding to the recognized direction, and performing the function of the display device corresponding to the selected image of the different hand gesture. recognizing that a user's hand is moved toward a direction where one image among the plurality of images of the different hand gestures (320a-320d) is disposed, selecting the image of a different hand gesture corresponding to the recognized direction, and performing the function of the display device corresponding to the selected image of the different hand gesture.