An autonomous mobile system according to an embodiment is an autonomous mobile system that autonomously moves in a facility provided with an area set as a clean area and an area set as an unclean area. The autonomous mobile system searches for a route along which the autonomous mobile system moves based on a rule of entry to the clean area and the unclean area. In the rule, when the autonomous mobile system is associated with a cleanliness flag, the autonomous mobile system is allowed to enter the clean area and prohibited from entering the unclean area, and when the autonomous mobile system is associated with an uncleanliness flag, the autonomous mobile system is allowed to enter the unclean area and prohibited from entering the clean area.