1. A method for providing recommended search term corresponding to an image by using a display device, the method comprising: receiving a drag signal indicating that an image or a portion of the image has been dragged to a search window provided on a display screen, the image being included in a content displayed on the display screen of the display device; and displaying one or more search terms related to the image or the portion of the image on the search window as the recommended search term based upon the received drag signal.