PROBLEM TO BE SOLVED: To appropriately determine a process plan constituting a mold forging process for forming a desired target shape and a die plan to be used in the process plan. SOLUTION: In a process design computer F40 having a CPU F41 and generating a process plan including one or more steps of forming a work into a predetermined target shape, the CPU F41 inputs the shape of the work and the target shape. Based on the acceptance, the shape of the work and the target shape, the process plan including the mold plan to be used in each process is decided, and when the process plan is decided, each process is composed of a plurality of virtual mold blocks. A virtual die is defined, and a simulation of forging with the virtual die in each process is executed and analyzed. [Selection diagram] FIG. 10
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