Abstract: A ventilation apparatus includes an air supply blower; an exhaust blower; a sensor that detects air quality; and a control unit that controls air flow rates. Upon receipt of an instruction for an operation based on an air flow differential indicating a difference between a specified supply air flow rate and a specified exhaust air flow rate, for a first blower that is either the air supply blower or the exhaust blower, the control unit obtains a first air flow rate from air flow rate setting information establishing a relationship between an air quality level and the air flow rates and controls the first blower at the first air flow rate, and for a second blower, the control unit computes a second air flow rate by using the first air flow rate and the air flow differential and controls the second blower at the second air flow rate.