Abstract: [Object] To provide a part, which seems to be provided with an excessive 3D effect, to a user with use of a user interface with which the user easily grasps the part intuitively, [Solving Means] Edge extraction information indicating whether a pixel of interest is an edge part is generated, with a video signal for left eye or a video signal for right eye being used as an input signal, the video signal for left eye being captured for a left eye, the video signal for right eye. being captured for a right eye. Subsequently, based on the video signal for left eye and the video signal for right eye, a parallax between a captured image for left eye that is formed of the video signal for left eye and a captured image for right eye that is formed of the video signal for right eye is calculated.