A computer readable storage medium and an apparatus for reproducing text-based subtitle data are provided. The computer readable storage medium includes subtitle data based on the text including a style set and dialogue information. The style set includes much style information and the dialogue information includes text information, reference style information and local style information. The reference style information represents a piece of style information in the style information to be applied to the text information. The local style information is applied to a portion of the text information and the style set includes information associated with the dialogue information whether applied to predetermined style information. The predetermined style information is separated from the style information limited by the manufacturer of thecomputer readable storage medium. The subtitle data can be easily generated and edited. Output style of the subtitle data can be changed in various ways. In addition, a special style may be used to emphasize a portion of the subtitles.