Moving image data is delivered from an image provider server. A hierarchical data generation device decodes the moving image data and generates data for the moving image representing each frame in a plurality of resolutions, by reducing frames included in the moving image in a single or multiple stages. A decoder reads only data for a layer in the hierarchical data for each frame, the layer being determined by a resolution requested for display, and decodes the read data. This produces a series of frames representing frames in a requested resolution. A display device displays the frames so that the moving image is displayed in the requested resolution.