A method of controlling a display device according to one embodiment of the present specification includes the steps of displaying a digital content, displaying a capturing window in a manner of overlapping the digital content, wherein the capturing window captures an inside area of the capturing window, detecting a first control input moving the digital content on an inside of the capturing window, moving the digital content according to the first control input and including the digital content, which moved to the inside of the capturing window, in a capturing object, detecting a second control input moving the digital content on an outside of the capturing window, and moving the digital content according to the second control input and excluding the digital content, which moved to the inside of the capturing window by the second control input, from the capturing object.