please tell me how to generate programme for manufacturing a product using cad model?
is there any specific software for program generation ?
Your CNC will require CAM software to generate the tooling paths. CAM software ranges from free to very expensive. You'll want to find a program that works with your CAD data and CNC.
Specific programs include:
MasterCAM, SolidCAM, GibbsCAM, CAMworks, SurfaceCAM, DelCAM,..
This article describes all the steps needed to make a CNC Part from a CAD Model: