There is provided a technique that can reduce the possibility of misjudging that a road section is inaccessible to vehicles. An inaccessible road section estimation system includes a regional road section extracting part that extracts regional road sections, each of the regional road sections being a road section in a target region, the target region being an area where a factor causing a road section to become inaccessible has occurred; and an inaccessible road section estimating part that estimates, as an inaccessible road section, a road section around which a mobile unit has detoured after occurrence of the factor, among the regional road sections.
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