A contents display control means displays video contents in a contents display screen area, a virtual space display control means displays a two-dimensional or a three-dimensional virtual space and an object appearing in the two-dimensional or the three-dimensional virtual space in a virtual space display screen area, and a motion control means controls, when the video contents is displayed in the contents display screen area, a motion of the object, with reference to additional information of the video contents and motion control information specifying the motion of the object when the additional information satisfies a certain condition. Accordingly, a novel video contents display method can be provided with the use of the additional information multiplexed into the video contents.