21. An apparatus for reproducing a text subtitle stream recorded on a recording medium, the apparatus comprising: a buffer configured to preload the text subtitle stream, character data for a text subtitle represented in a particular language, the text subtitle stream including a style segment defining a group of region styles and at least one presentation segment, the presentation segment containing at least one region of text and the region of text being linked to one of the group of region styles defined in the style segment by an identifier, wherein the style segment and the presentation segment are encapsulated into a respective PES packet, the PES packet including packet data and stream identification information indicating a type of the PES packet, the stream identification information being included in a header of the PES packet; and a text subtitle decoder configured to decode and present the presentation segment according to a continuous presentation flag contained in the presentation segment, the continuous presentation flag indicating whether continuous presentation is required for the presentation segment with respect to a previous presentation segment, a presentation start time of the presentation segment is equal to a presentation end time of the previous presentation segment if the continuous presentation flag indicates that the presentation segment is continuously reproduced from the previous presentation segment.
21. An apparatus for reproducing a text subtitle stream recorded on a recording medium, the apparatus comprising: a buffer configured to preload the text subtitle stream, character data for a text subtitle represented in a particular language, the text subtitle stream including a style segment defining a group of region styles and at least one presentation segment, the presentation segment containing at least one region of text and the region of text being linked to one of the group of region styles defined in the style segment by an identifier, wherein the style segment and the presentation segment are encapsulated into a respective PES packet, the PES packet including packet data and stream identification information indicating a type of the PES packet, the stream identification information being included in a header of the PES packet; and a text subtitle decoder configured to decode and present the presentation segment according to a continuous presentation flag contained in the presentation segment, the continuous presentation flag indicating whether continuous presentation is required for the presentation segment with respect to a previous presentation segment, a presentation start time of the presentation segment is equal to a presentation end time of the previous presentation segment if the continuous presentation flag indicates that the presentation segment is continuously reproduced from the previous presentation segment. 23. The apparatus of claim 21 , wherein the buffer is configured to preload the text subtitle stream including style segment encapsulated into the PES packet which comprises at least one transport packet.