1. An energy replenishment quantity control system for controlling a replenishment quantity of one kind of energy in a moving body which utilizes more than one kind of energy replenished from outside for a driving which is consistent with a driving policy selected from a plurality of driving policies, comprising: a route searching part configured to search a route from an energy replenishing location to a destination, when the energy replenishing location is a current position; an energy cost calculating part configured to calculate more than one energy cost for a single route selected from one or more routes searched by the route searching part in using at least one of the more than one kind of energy based on information about the already-selected single route where the moving body can travel without replenishing the one kind of energy from outside on the way to the destination after having replenished the one kind of energy at the energy replenishing location; an energy replenishment quantity controlling part configured, during replenishing the one kind of energy at the energy replenishing location, to obtain a recommended energy replenishment quantity calculated based at least on a total distance of the already-selected single route which can be greater than a reachable distance by the one kind of energy, the recommended energy replenishment quantity being required to achieve a driving policy determined based on a difference between two of the more than one energy cost for the already-selected single route and the driving policy selected by an operator, to start replenishing the one kind of energy, and to end replenishing the one kind of energy when a replenished quantity has reached the obtained recommended energy replenishment quantity.