PURPOSE: To improve handleability by enabling a flexible design support, enabling arbitrary changes between processes by a worker when necessary and enabling free repeated change processings of a design work.

CONSTITUTION: A system control part 3 controls a design work definition part 7 making each design process into module based on the information inputted from a data input part 1, design procedure information 5 and each interprocess related information 6. In design process information 4, various kinds of information to generate in the process where the design work definition part 7 is executed is stored, the succession of the information to the next process is performed and input man-hour is reduced. For the succession of interprocess information when a procedure which is different from the design procedure information 5 is executed, the automatic generation of an input format is performed based on each interprocess related information 6 and the design process information 4. Thus, a design procedure can be automatically led and an efficient work can be performed even when the work is performed by an arbitrary design a procedure.