A client system for implementing a 3D virtual reality by using X3D (extensible 3D) data provided from a service server includes an applet, a communication module, and a browsing means. The applet communicates with the service server to receive the X3D data and transmit the received X3D data. The communication module is connected to the applet in order to provide a communication between the service server and a client. The browsing means parses the X3D data received through the communication module to construct a scene graph; conducts a rendering of the scene graph to have a predetermined form; and, then, displays the scene graph on a display window of the client.
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