1. A method of adding a segment index for re- segmentation, comprising: determining, by a determining unit, whether a re-segmentation happens; looking, by the determining unit, in a re-segmentation header of a current block, for a bit indicating the end of the re-segmentation header and the start of other information if it is determined a re-segmentation happens; and inserting, by an inserting unit, two bits immediately before the bit indicating the end of the re-segmentation header and the start of other information, a first bit indicating a higher level re-segmentation has happened, and a second bit indicating one part generated in this re-segmentation.