3. The method of claim 1 , wherein revising the caption curve comprises: changing a portion of the caption curve from a first value indicating the caption segment is displayed to a second value indication the caption segment is not displayed.
3. The method of claim 1 , wherein revising the caption curve comprises: changing a portion of the caption curve from a first value indicating the caption segment is displayed to a second value indication the caption segment is not displayed. 4. The method of claim 3 , wherein the change of the portion is at an end of the caption segment.