Recently, many appications of VR called Collaborative Virtual Environment (CVE) have been proposed and their cooperationmethods by users and scalability issues to support a number of users have been investigated. However, by using conventional client/servermodel, the usability of cooperative works by users degrades and scalability in CVE cannot be realized as the number of the user increases. Also, in those previous researches, user interaction to 3D objects was not considered.

In order to overcome those difficulties, we introduce a new method which uses P2P network to realize scalable CVE and recommendation system which uses user ?s interest to present and offer the proper objects in CVE. Using our suggested method, the 3D objects are distributed on the P2P networks and their computing loads can be reduced, eventually the scalability of the CVE can be improved. Furthermore, by reflecting user interest information to the application system, user can access and communicate to 3D objects and contents in which he is more interested with higher priority. Thus, the total usability of the system can be improved. In this paper, we propose a new CVE system using P2P network to realize overlay network and methodology to realize user recommendation system to reflect user ?s interest.