Provided is an ozone generation system having low running costs. This ozone generation system comprises an electrical charge unit price storage unit for storing an electrical charge unit price and a gas charge unit price storage unit for storing a gas charge unit price. The values for ozone concentration and gas flow rate, which are basic parameters for the amount of ozone generated, at which running costs will be at a minimum, is determined on the basis of the electricity charge unit price stored in the electricity charge unit price storage unit, the gas charge unit price stored in the gas charge unit price storage unit, and the required ozone generation amount required for ozonification gas. A gas flow rate regulator is controlled such that the determined gas flow rate is reached, and the power of a power source for an ozone generator is controlled such that the determined ozone concentration is reached.