Most of VPN (Virtual Private Network) protect the information only through the public network. There is need to develop the various forms of VPN. Therefore, various types of VPN are going to be studied in the view of SCG (Secure Communication Group). In this paper, the problems of path-definition method and the area-definition method to construct SCG are analyzed, then possible models among VPNs based on SCG technology are reviewed. This paper proposed the hierarchical VPN based on SCG number that apply the area-definition method to the internet, and analyzed the characteristics of the proposed VPN model on the point of the authentication frequency and the number of management keys.