METHOD FOR REDISPLAYING EDITED GRAPHIC

PURPOSE:To shorten time required for redisplaying an edited graphic by executing decision whether each graphic element is to be replotted or not only once and restricting the graphic element to be replotted to graphic elements to be included or overlapped in/to specified redisplay area. CONSTITUTION:Graphic elements 1 to 6 positionally relating (included or overlapped) to the specified redisplay area R10 out of graphic elements 1 to 6 are found out and redisplay areas R11, R12 including all the found graphic elements 1 to 6 are found out. These graphic elements 1 to 6 are plotted in the 2nd image memory 23b and the contents of the area R10 are transferred to the 1st image memory 23a. Prior to the transfer, the area R10 is stored in the memory 23a. Prior to the transfer, the area R10 is stored in the memory 23a as a background. The transfer to the memory 23a makes it possible to complete the edited graphic 10 in the memory 23a and redisplay it.