10. A method of recording text subtitle stream on an optical disc, the method comprising: defining the text subtitle stream to include a first segment and a second segment, the first segment including region style information including a default style to be applied to a text subtitle region of a display screen by default, the second segment including text data to be displayed within the text subtitle region of the display screen and inline style information to be applied to a specific portion of the text data which overrides the region style information, defining, on the optical disc, a playlist including at least one playitem and at least first and second subplayitems, the playitem specifying a time based playing interval from in time until out time associated with at least one audio/video (AV) stream file including at least one audio/video (AV) stream and the first subplayitem specifying a time based playing interval from in time until out time associated with at least one text subtitle stream file including at least one text subtitle stream; and recording the defined text subtitle stream and the playlist on the optical disc, wherein the first subplayitem indicates a plurality of independent text subtitle stream files having different language codes, respectively, and wherein the first subplayitem is associated with reproduction of the text subtitle stream and is synchronized with the playitem, and the second subplayitem is associated with reproduction of a browsable slideshow and is not synchronized with the playitem.
12. The method of claim 10 , wherein the default style of the text subtitle region is specified by at least one of a region position, a region size, a region background color, a text position, a text flow, a text alignment, a line space, a font identification, a font style, a font size, and a font color defined in the region style information.