A data playback method according to one aspect of the present disclosure is a data playback method for displaying a video in a first luminance range with graphics being superimposed on the video. The method includes: determining whether a playback device has a function for converting first graphics in a second luminance range narrower than the first luminance range to second graphics in the first luminance range; when the playback device has the function, causing the playback device to convert the first graphics to the second graphics and to display the video with the second graphics being superimposed on the video; and when the playback device does not have the function, causing the playback device to display the video with third graphics different from the second graphics being superimposed on the video.