15. A method of reproducing a text subtitle stream recorded on an optical disc, the method comprising: reading a first segment included in the text subtitle stream, the first segment including first style information, the first style information including at least one of composition information and rendering information for a region including text subtitle data; reading a second segment included in the text subtitle stream, the second segment including the text subtitle data and second style information, wherein the second segment is linked to the first segment, the second style information includes font information for the text subtitle data, wherein the font information is declared at a beginning of at least a portion of the text subtitle data being affected by the font information, wherein the second segment includes a length indicator indicating a length of the at least the portion of the text subtitle data, and wherein each of the first segment and the second segment includes a segment identifier identifying the first segment and the second segment, respectively; and reproducing the text subtitle data using the first and second style information.
15. A method of reproducing a text subtitle stream recorded on an optical disc, the method comprising: reading a first segment included in the text subtitle stream, the first segment including first style information, the first style information including at least one of composition information and rendering information for a region including text subtitle data; reading a second segment included in the text subtitle stream, the second segment including the text subtitle data and second style information, wherein the second segment is linked to the first segment, the second style information includes font information for the text subtitle data, wherein the font information is declared at a beginning of at least a portion of the text subtitle data being affected by the font information, wherein the second segment includes a length indicator indicating a length of the at least the portion of the text subtitle data, and wherein each of the first segment and the second segment includes a segment identifier identifying the first segment and the second segment, respectively; and reproducing the text subtitle data using the first and second style information. 16. The method of claim 15 , wherein the composition information includes position information for positioning a text subtitle represented by the text subtitle data on a display.