A video data conversion method is provided. The video data conversion method comprises the following steps. Video images currently played on a video source are captured, and are converted into dynamic texture data having a size and a format that meet requirements of a three-dimensional (3D) engine. The dynamic texture data is sent to the 3D engine, which then generates a map from the dynamic texture data. The map is mapped to a 3D user interface (UI) to generate a dynamic texture map.