According to one embodiment, a video processing apparatus includes a viewer position detector, a viewing area information calculator, and a viewing area controller. The viewer position detector is configured to detect a position of a viewer using an image taken by a camera. The viewing area information calculator is configured to calculate a control parameter so as to set a viewing area, in which a plurality of parallax images displayed on a display are viewed as a stereoscopic image, at an area depending on the position of the viewer. The viewing area controller is configured to set the viewing area according to the control parameter in synchronization with a start of displaying a stereoscopic image, and then, keep the set viewing area until receiving an indication for adjusting the viewing area.