A movable object position determining unit of a control device for a movable object is configured to determine whether a current position of the movable object is separated a predetermined distance or more from a transit point which is a junction between a valid movement track and a candidate movement track. A change processing unit is configured to change the candidate movement track as a new valid movement track when a track change determining unit determines that the current position of the movable object is separated the predetermined distance or more from the transit point as the junction.