1. A playback apparatus that plays back a text subtitle stream corresponding to a predetermined language and being selected from a plurality of text subtitle streams during a playback of moving pictures, the playback apparatus comprising: a storing unit storing therein an identifier of a language that is eliminated from selection options because inconvenience is caused during the playback, as a supplementary language; an inquiry unit operable to inquire of a user whether the user wishes to increase a number of languages in which subtitles are displayable even if inconvenience may be caused; and a selection unit operable to select, in a case where the user performs an affirmative operation in response to the inquiry by the inquiry unit, a text subtitle stream corresponding to the supplementary language from the plurality of text subtitle streams.