A system for centrally managing credential information of a user and a virtual object of a user across a plurality of virtual world (or corresponding virtual world servers) is disclosed. The system includes an identity service module for managing an authentication request (e.g., verifying credential information of a user) from a user and an inventory service module for managing virtual properties of a user. Furthermore, a method for logging in a virtual world by using the system is disclosed. A method for teleporting a virtual property from a virtual world to another virtual world by using the system is disclosed. A method for logging out from a virtual world by using the system is also disclosed.