In Router Vision for Java, it is possible to create a router path by the various processing methods. Although there is much CAM software which works using the compensation function of a processing machine recently, these data is created as independent data. It is the feature that a realistic router path can be created also to complicated data. Each diameter of a router tool offsets the outside object of each router layer by the radius, and a router path can be created. Simultaneously, fade-in/fade-out can also be created. An inspection function can be used and the router path after being created can also be checked (isn't a substrate side deleted? can't the uncut portion beyond specification be performed?). It can create so that the path of a slit may be cut in the shape of a lattice. A router path can be created in contour line form so that it may not leave scraps. It cuts outside from a center.Outside, an offset router path is created. It can create by stroke.