An energy replenishment quantity control system 100 for controlling a replenishment quantity of each energy source in a moving body V which utilizes more than one kind of energy source, comprises a route searching part C10 configured to search a route to a destination, an energy cost calculating part C12 configured to calculate an energy cost of each energy source in using the respective energy sources based on information about the route searched by the route searching part C10, an energy replenishment quantity controlling part E14 configured to control the replenishment quantity of the energy sources based on the energy costs calculated by the energy cost calculating part C12.