PROBLEM TO BE SOLVED: To detect a present or future accident occurrence risk and to visualize the accident occurrence risk based on the relationship between the accident risk occurred in the past and geographic conditions of the area in which vehicles run.SOLUTION: An accident risk visualization system visualizes an accident risk associated with the vehicle running in a specific geographic area, and holds map information which is the information representing a topography in the geographic area. The map information which is the information representing the topography in the geographic area is held over a plurality of time points, and the time and the position in which an alarm notifying the accident risk occurred in the vehicle are held as alarm history information together with factor type information showing whether or not the factor of the alarm is the topography, and the map information of that time is extracted according to the time designation from the outside. When the risk due to the topography around that time is available by retrieving the alarm history information, image data including an alarm icon displayed at the position included in the alarm history information is generated in the map information, and a screen display is performed based on the image data.SELECTED DRAWING: Figure 3
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