1. A method of adding a segment index for re-segmentation, comprising steps of: determining whether a re-segmentation happens; looking for in a re-segmentation header of a current block 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 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.