Reproducing device

A reproducing device for playing back data from a recording medium, including: playback circuits for playing back at least two stream data in a time division multiplexing manner from a recording medium that records: first stream data which includes first video data, first audio data, and first sub-picture data, and second stream data which includes second video data, second audio data, and second sub-picture data; and selection circuits for conducting at least one of: switching from the first video data to the second video data, switching from the first audio data to the second audio data, and switching from the first sub-picture data to the second sub-picture data; wherein data which is newly switched by the selection circuits and the data which is not switched by the selection circuits, are synchronously superimposed and outputted.