1. A recording medium having a data structure for managing reproduction of text subtitle data, comprising: a recording area storing a text subtitle stream that includes a dialog style segment and at least one dialog presentation segment associated with the dialog style segment, the dialog 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 and text box positioning information for positioning a text box in the region, and the dialog presentation segment including at least one region subtitle information, the region subtitle information including text subtitle data and a region style identifier, the region style identifier identifying one of the sets of style information in the dialog style segment to apply to the text subtitle data.