1. A graphic processing system for automatically reconstructing dimensional and geometric constraints of a graphic comprising: a dimension-geometry constraint succession judging table which is referred to for judging whether or not the dimensional and geometric constraints of the graphic are to be succeeded; a graphic element managing table for storing graphic information for graphic elements constituting the graphic in a one-to-one correspondence with element identifications (ID); a dimension-geometry constraint managing table for storing the dimensional and geometric constraints for the graphic elements stored in said graphic element managing table; and a constraint reconstructing means for updating, where editing is further applied to a certain graphic and a part of the graphic elements constituting said graphic is changed by said editing, the graphic information of said changed graphic elements in the graphic element managing table; for reading out the dimensional and geometric constraints given with respect to said changed graphic elements from the dimension-geometry constraint managing table; and for referring to the dimension-geometry constraint succession judging table for said read out dimensional and geometric constraints so as to either (i) retain the dimensional and geometric constraints when the related dimensional and geometric constraints should be succeeded in the dimension-geometry constraint managing table or (ii) delete said dimensional and geometric constraints when related dimensional and geometric constraints should be deleted from the dimension-geometry constraint managing table.