Recently, many natural disasters (e.g. 2011 Tohoku Tsunami) have occurred in Japan. Under the disaster conditions, the people cannot effectively evacuate even so if they know the geographical information of the neighborhood area well, because traffic conditions are drastically altered from their ordinary everyday manner. Thus, evacuation planning is an important issue. One of the methods for the evacuation planning is the use of an evacuation simulator. Keon, Steinberg, Yeh, et al. (2014) proposed an simulator for the evacuaion with flood as a Web application although it could only deal with a wide-area evacuation and a specific location. Therefore, we propose an evacuation support system, on a Web platform with MAS and GIS, that can simulate with more specific population properties regardless of the target location and execution environment. We propose a novel evacuation simulator on the Web and an approach to enable decision making for an evacuation by our simulator. A user can run the simulation on user-specific properties by configuring evacuee parameters such as an evacuation area and a shelter on an external online map service. We believe that one of the most effective target groups that could use this application is workers who work outside their local area and is unfamiliar because they probably do not know how to get to a safe place in an area that is unfamiliar to them. In this situation, a prompt simulation of our system could be expected to provide appropriate evacuation planning. Accordingly, we simulate evacuations in a seaside industrial zone where a large company typically exists and consider the simulation results. The software design of our system is more accessible than previous studies for the user. Further, the user can perform a more detailed evacuation simulation with some properties. This system can apply to not only the evacuation simulation but also pedestrian simulation on the map. The prediction of a disaster is still challenging. Thus, people need to have accurate knowledge of the disaster and be able to prepare for an unexpected occurrence. Our simulator can provide an environment in which a user can imagine a disaster situation, execute a simulation and learn more about the evacuation without supervision.