1. A computing system for displaying a GUI element on a natural user interface on a display, the computing system comprising: a display configured to display a natural user interface of a program executed on the computing system; a gesture sensor configured to detect a gesture input directed at the natural user interface by a user; and a processor configured to execute: a gesture-recognizing module configured to recognize a registration phase, an operation phase, and a termination phase of the gesture input; and a gesture assist module configured to display a GUI element overlaid upon the natural user interface, the GUI element being first displayed in response to recognition of the registration phase by the gesture-recognizing module, and including a visual or audio operation cue to prompt the user to carry out the operation phase of the gesture input, and a selector manipulatable by the user via the operation phase of the gesture.