Provided is a control system, including: a power source control unit for controlling a power source included in a mobile object; a mobile object control unit for controlling the mobile object; and an update control unit for receiving an update program of the power source control unit and the mobile object control unit, and transmitting the update program to one of the power source control unit and the mobile object control unit to be updated by the update program, wherein the power source control unit includes a first storage area to be updated and a second storage area not to be updated by the update program, and the power source control unit includes, in the second storage area, first control information for causing the power source to supply power in a case where the first storage area is updated by the update program transmitted from the update control unit.