1. A recording medium for reproducing text subtitle streams, the recording medium comprising: a data area storing at least one text subtitle stream, each text subtitle stream including a dialog style segment defining a group of region styles and a plurality of dialog presentation segments, each dialog presentation segment containing at least one region of dialog text each of which is linked to a selected one of the group of region styles, wherein a first region of dialog text included in a current dialog presentation segment contains a continuous presentation flag which indicates that continuous presentation is required between the first region of dialog text and a second region of dialog text included in a previous dialog presentation segment.