12. The apparatus of claim 11 , wherein the composition information includes position information for positioning a text subtitle represented by the text subtitle data on a display.
11. An apparatus for recording data on an optical disc, the apparatus comprising: a pickup unit configured to record data on the optical disc; and a controller configured to control the pickup unit to record a text subtitle stream including at least a first segment and a second segment, the first segment including first style information and the second segment including text subtitle data and second style information, wherein the second segment is linked to the first segment, the first style information includes at least one of composition information and rendering information for a region including the text subtitle data, and 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.