If it is detected that moving image data stored in a buffer increases in size beyond a first size and then reaches a second size, a portion of the moving image data from a head thereof stored in the buffer, corresponding to the first size, is retrieved and output as a moving image object. If it is detected that the final moving image data belonging to a chapter is stored in the buffer, the whole moving image data stored in the buffer is retrieved and output as a moving image object. Even immediately after the moving image data corresponding to the first size is retrieved from the buffer, the moving image object of the second size for seamless connection between chapters is acquired.