1. A recording medium storing a data structure for managing reproduction of data by a reproducing device, the data structure comprising: at least one audio/video (AV) stream file and at least one text subtitle stream file, each text subtitle stream file including a style segment and at least one presentation segment associated with the style segment and the AV stream file including at least one of audio data and video data, the style segment including at least one set of style information, each set of style information providing region positioning information for positioning a region in an image, text box positioning information for positioning a text box in the region, and text flow information indicating a character progression of text string data, and the presentation segment including at least one region subtitle information, the region subtitle information including text subtitle data and a region style identifier; and at least one clip information file containing attribute information and timing information of a corresponding stream file, wherein the at least one clip information file is separate from the AV stream file and the text subtitle stream file, one of the at least one clip information file has one to one correspondence with the AV stream file, and another clip information file has one to one correspondence with the text subtitle stream file, the text subtitle stream file exists as a separate file from the AV stream file, and the text subtitle data includes at least one of text string data and style data, and the region style identifier identifies one of the sets of style information in the style segment to apply to the text string data such that the text string data appears in the text box in which the identified set of style information is applied.