US Patent 7574119 Information playback apparatus and information playback method

There are provided a first image information output unit which overlaps first sub-picture information having high resolution HD onto main image information having high resolution HD to be outputted in accordance with a required image output format, and a second image information output unit which overlaps second sub-picture information having low resolution SD onto information into which the main image information having high resolution HD has been converted to have the low resolution SD to be outputted in accordance with a required image output format.