In this paper, we propose a mechanism for managing the collaborative interactions among the distributed users in our developed SmartCU3D, an Internet Collaborative Virtual Environment (CVE) system. In this mechanism, the message routing in the system becomes adaptive to the application and the user's runtime interaction. It's achieved by giving the Object- Oriented style collaborative behavior description along with the 3D environment definition for every individual CVE application. The collaborative behavior description defines the functional roles selected by the users in the application, and the behaviors for every functional role. The interaction messages for maintaining the virtual world's consistence are generated according to the behavior definition of the interactive entity's functional role. And the interaction message will be routed among the affected interactive entities in the Internet CVE. The motivation of this research is to achieve a framework to support a flexible and adaptive interaction management mechanism for developing different CVE applications.