In this study, I have researched and developed a 3-Dimentional cityscape examination system in order to help the administration and the inhabitants examine and reach a consensus on a certain cityscape policy. By utilizing a globaly standardized 3-D technology called the VRML in the sytem, an interactive cityscape examination using the Internet has been made possible. In addition, I have designed the system so that, admistrative map data can be utilized to efficiently produce a high-precision 3-D cityscape data. After actually applying the system in a real city planning process, I was able to concretely grasp the influence a building height regulation has on a cityscape.