Abstract: Based on a recognition result of a recognition sensor installed in a mobile body, a mobile body control system calculates a first target path for moving to a destination while avoiding a risk around the mobile body. Further, based on the first target path, the mobile body control system calculates a second target path having higher granularity than the first target path. Then, the mobile body control system controls the mobile body so as to follow the second target path. The mobile body control system determines in which field the mobile body moves, a normal field or a specific field having more risks than the normal field. When the mobile body moves in the specific field, the mobile body control system reduces a frequency of update of the first target path compared with that when the mobile body moves in the normal field.