It is an object of the present invention to provide a system that is used to provide support so that a pilot can perform flight operations that reduce noise pollution, by devising this system so that noise conditions on the ground are calculated and displayed on the basis of map information for the flight area in which facilities and the like are described, environmental conditions in the flight area such as the wind direction and wind velocity, or the temperature and density of the atmosphere, and noise generation data for the aircraft itself. The apparatus for supporting low-noise flight according to the present invention comprises means for estimating the noise generated by an aircraft using flight data such as the flight speed, the climb and descent rates, the engine power and the like of the aircraft, means for calculating the level at which the noise generated by the aircraft is propagated in the respective regions on the ground, and means for displaying the calculation results on a map in quantitative terms.