A flood indicator device 40 includes a terminal control unit 46, and the terminal control unit 46 records flood point information T1, with a detection result of a flood point on a road and a classification of a flood situation at the flood point, which is determined on the basis of the driving status data of a vehicle 10 running at the detected flood point, is linked to each other, generates flood detection information P10, changing an indicator mode of the detection result based on the classification of the flood situation at the point of flood,as flood detection information P10 obtained by arranging the detection result on the basis of the flood point information T1 over a position on a map corresponding to the flood point, and issues the flood detection information P10 to an indicator unit 43.
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