A stream processing section (12) analyzes input stream data and, if the stream data includes a compressed/coded graphics object, decodes the graphics object line by line and writes the decoded graphics object into a graphics object buffer (14), and, if the stream data includes control information of a graphics object, writes the control information into a control information buffer (13). A graphics control section (15) renders a graphics object stored in the graphics object buffer (14) in a graphics plane (16) based on control information stored in the control information buffer (13). When a decoding error has occurred, the stream processing section (12) restarts decoding from the next or a subsequent line.