PURPOSE: To change the data while writing them into a table by storing the cell data contents which are edited and changed for each row and column into a storage together with the change contents of the control symbols set before and after a cell.

CONSTITUTION: An input data selector 3 sorts the editing data inputted from an input part 2 into the character data and the control data and then sends these data to a character editing part 4 and a table structure editing part 5 respectively At the same time, an external storage input/output control part and internal storage part 6 reads the data out of an external storage part 7 and sends them to a ruled line data conversion part 8 after the temporary storage. At the same time, the part 6 changes the corresponding area of the stored data and rewrites the part 7 based on the change data inputted from both editing parts 4 and 5. Thus the processing time is shortened for change/ editing of the cell data.