74. An optical disc player for reproducing text subtitle streams downloaded from an external source, the optical disc player comprising: an audio decoder configured to decode audio streams recorded on the optical disc into audio data; a video decoder configured to decode video streams recorded on the optical disc into video image data; a text subtitle decoder configured to decode a text subtitle stream recorded on the optical disc into text subtitle image data; and an image superimposition unit configured to superimpose the decoded text subtitle image data with the decoded video image data, wherein the text subtitle decoder comprises: a text subtitle processor configured to parse the text subtitle stream into composition information, rendering information, and text data for at least one region, the text data including one or more text strings for each region; a text renderer configured to render the text strings into graphic data for each region according to the rendering information; and a presentation controller configured to compose the rendered graphic data according to the composition information.
76. The optical disc player of claim 74 , wherein the text subtitle processor is configured to parse the text subtitle stream into the rendering information including at least a portion of region style information specifying one style defined by a style segment.