A battery requiring power generation determining unit is operable to determine first power required by the battery depending on a battery condition. An electric component using power determining unit is operable to determine second power used by the electric components. An feeding indispensable power determining unit is operable to determine feeding indispensable power. A power generation determining unit is operable to determine a first power generation to be generated by the generator based on the first power, the second power, and the feeding indispensable power. The feeding indispensable power determining unit determines the feeding indispensable power depending on a running mode of the vehicle.