It can check visually how it is actually processed on the screen of a personal computer. Since it is displayed as if it had actually processed it, a processing image is far held intelligibly rather than it sees a fine numerical value and a fine rate. process is checked and it can confirm easily whether to be whether there is any error and a best state Moreover, it is possible to grasp incomprehensible information only by seeing a drawing by using a report function. It creates and is just going to carry out the processing simulation of dissolve in router path. Simulation speed can also be adjusted. Overlap condition can be seen thoroughly. The appearance to cut is expressed by animation. It creates and is just going to carry out the processing simulation of cross hatch in router path. Neither complicated data nor knowledge is required at all. A simulation is possible if processing data is always created to a passage. The report about a simulation can be displayed.