A control system for a movable body is mountable on the movable body. The control system includes controllers and a detector. The controllers are configured to control functional systems of the movable body. The detector is configured to detect a movement situation of the movable body. Priorities corresponding to movement situations of the movable body are in advance assigned to each of the plurality of functional systems. When at least one of the plurality of controllers malfunctions, control resources of normal controllers, among the plurality of controllers, which do not malfunction are preferentially distributed to one or more of the functional systems having a high priority according to the movement situation of the movable body at that time.