A stent having a main body with a proximal end and a distal end section having proximal and distal openings used for treatment of lesions in blood vessels and hollow organs, particularly at the ostium of side branches. With the interactive facility software, various sorts of data such as a tool compensation amount required for a working operation and a work coordinate system can be read at any time by accessing to a memory storing a lathe turning control software and a milling control software. The method also allows further splitting of blocks during local refinement at levels of higher resolutions.