Honda Motor Co., Ltd.

Takeyasu Suzuki

Takeshi Imai

Tadafumi Nogawa

Aiko Sugawara

Yasunori Hada

A navigation server capable of guiding a mobile subject such as an automobile by a navigation device, while appropriately evaluating the level of safeness of individual link in a disaster occurring area in consideration of the actual disaster condition is provided. According to the navigation server of the present invention, the links included in the disaster occurring area are extracted, and the cost of each of the extracted links is evaluated on the basis of the probe information. There is high probability that the spatial and temporal moving pattern of the automobile (a first mobile subject) represented by the probe information reflects the influence of the disaster. Therefore, the level of the safeness of individual link included in the disaster occurring area may be evaluated as the cost of individual link accurately in consideration of the actual disaster condition and road condition. Further, by transmitting the road traffic information generated on the basis of the cost of individual link to the navigation device, it becomes possible to make the navigation device guide the automobile (a second mobile subject) to avoid the influence of the disaster in consideration of the actual disaster condition and road condition.

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Kawasaki, Japan

Takeyasu Suzuki