An object of the present invention is to work on a subject to adjust the degree of interest. An environment control system (10) includes: a biological information acquisition unit (20) that acquires biological information of a subject (T); and a target person based on the biological information acquired by the biological information acquisition unit (20). An interest degree estimating unit (30) for estimating the degree of interest of (T), and an environment control unit (40) for adjusting the degree of interest of the subject (T) by controlling the environment around the subject (T). Is provided. [Selection diagram] Fig. 1【課題】対象者に働きかけてその関心度を調節する。【解決手段】環境制御システム(10)は、対象者(T)の生体情報を取得する生体情報取得部(20)と、生体情報取得部(20)が取得した生体情報に基づいて、対象者(T)の関心度を推定する関心度推定部(30)と、対象者(T)の周辺の環境を制御することで対象者(T)の関心度を調節する環境制御部(40)とを備える。【選択図】図1