Information useful for aircraft control is provided for an airspace where a plurality of aircraft move. An airspace information provision system includes: a surrounding turbulence estimation unit configured to estimate surrounding turbulence occurring around first aircraft flying in a predetermined airspace where a plurality of aircraft fly, based on at least specification information, operation information and position information of the first aircraft, for the first aircraft; a flight disturbance information generation unit configured to generate flight disturbance information indicating a disturbance element affecting the aircraft flying in the predetermined airspace based on the surrounding turbulence; and a flight disturbance information provision unit configured to transmit the flight disturbance information to second aircraft flying in the predetermined airspace or flying toward the predetermined airspace.