16. An apparatus for reproducing text subtitle streams, the apparatus comprising: a decoder configured to decode at least one text subtitle stream, each text subtitle stream including a style segment defining at least one region style and a plurality of presentation segments to which the style segment applies, each presentation segment containing at least one region subtitle and presentation time information, each region subtitle being linked to one of the region styles and including region information associated with the corresponding region subtitle, the presentation time information defining a presentation time of the corresponding presentation segment, the presentation time information including first information for indicating a presentation start time of the corresponding presentation segment and second information for indicating a presentation end time of the corresponding presentation segment, wherein the region information includes data type information and data, the data being defined as inline style information or text string information according to the data type information, the data type information including an end-of-inline-style field for representing that each of the inline style information is applied until an end of the inline style information is detected; and a controller operably connected with the decoder and configured to control the decoder to decode the at least one text subtitle stream based on the style segment and the region information.
16. An apparatus for reproducing text subtitle streams, the apparatus comprising: a decoder configured to decode at least one text subtitle stream, each text subtitle stream including a style segment defining at least one region style and a plurality of presentation segments to which the style segment applies, each presentation segment containing at least one region subtitle and presentation time information, each region subtitle being linked to one of the region styles and including region information associated with the corresponding region subtitle, the presentation time information defining a presentation time of the corresponding presentation segment, the presentation time information including first information for indicating a presentation start time of the corresponding presentation segment and second information for indicating a presentation end time of the corresponding presentation segment, wherein the region information includes data type information and data, the data being defined as inline style information or text string information according to the data type information, the data type information including an end-of-inline-style field for representing that each of the inline style information is applied until an end of the inline style information is detected; and a controller operably connected with the decoder and configured to control the decoder to decode the at least one text subtitle stream based on the style segment and the region information. 18. The apparatus of claim 16 , wherein the inline style information is configured to change one of region presentation properties specified by the linked region style for the text string, and the region presentation properties comprises font-related properties.