Workshops are held with local residents participation as one technique by which residents plan roads and places along a route. Because residents without special knowledge participate in such workshops, it is necessary to show the contents intelligibly so that all participants might grasp the plan contents and examine them. Moreover, for community planning workshops, because the time during which they can be held is restricted, within that time, plan- related information must be organized efficiently for rapid examination and searching of its contents. As an interactive system, a real-time simulation (RS) is sought that allows rapid drawing and that has a structure to display the contents of a plan using a three-dimensional space model in real time. The purpose of this research is to build a system that supports environmental space design, which uses RS in the workshop, and which is applicable for evaluation of an actual street space maintenance plan.