The 3D visualization of observation data and the result of simulation becomes the useful analysis method recently. And by sharing the processed data between fellow researchers, we may have common view simultaneously and improve mutual understanding. So we realized the importance of the development of the middle-ware that supports the bi-directional and multipoint communication with 3D visualization tools. As we had been built VEMS (Virtual Earth Magnetosphere System) on AVS/Express (Application Visualization System), we developed the distributed object based middleware 'Milkyway' to act in union with them. It realized that the multipoint and bi-directional communication accelerates the understandings and helped the enlightenment of the new aspect from the modeled data.