The present invention is to provide an image forming process simulation device which can provide a suitable coping book for a defect in an image forming process unit quickly to the user a challenge. ; Receiving means for receiving image data to be subjected to the image forming process in the image forming process unit and, by using the image data, run a simulation of an image forming process that targets the image data in the image forming apparatus and execution means for, in the simulation the simulation process in the image forming apparatus characterized in that the defect management means for judging whether or not a fault occurs, an output means for outputting information about a result of the determination. ; Device simulations, simulation execution unit, fault management
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