PURPOSE: To automatically correct related components just by giving a prescribed correction instruction when correction is generated for the components of a group by expressing a connection state between group components with logical. data and coordinate data while adding the components related to the other components by connection data and the coordinate data at the time of an operation for preparing the group of graphics.

CONSTITUTION: An operator prepares the related component of a basic component by operating a CRT/keyboard 17. Then, after the graphic is completed, the basic component and the related component are related and registered to a connection state data base 11 and a coordinate data base 12. Then, in the case of preparing an analogous graphic with a reason such as design change or the like after completing graphic definition, it is performed corresponding to a graphic correction part. That is, first the operator selects the component to be corrected by operating the CRT/keyboard 17 and instructs to move the component lower for Δy. At this point of time, a group reconstructing processing is executed. Thus, the analogous graphic is completed.