POOR VISIBILITY ESTIMATION SYSTEM AND POOR VISIBILITY ESTIMATION METHOD

Provided are a poor visibility estimation system and a poor visibility estimation method that can estimate poor visibility using a simpler configuration. A center (200) has a change amount calculation unit (220) for calculating the change amounts of operation elements of vehicles (100, 110, 120). A visibility estimation unit (230) estimates poor visibility on the basis of the change amounts calculated by the change amount calculation unit (220). The center (200) also has a distribution unit (250) for distributing the estimation results of the visibility estimation unit (230).