PROBLEM TO BE SOLVED: To provide a plant cultivating system, a plant cultivating method, and a program capable of adjusting the light irradiating a plant so as to compensate for the lack of sunlight in the light period in one day. SOLUTION: The plant cultivation system emits a first light for emitting a first light for compensating for the lack of the sunlight to a plant to be cultivated by applying sunlight, and a first light is emitted from the light emitting portion 91. And a control unit 140 that reduces the amount of light emitted from the light emitting unit 91 when the sunlight that is supplemented and the light from the light emitting unit 91 that is applied to the plant exceeds a predetermined amount. [Selection diagram] Fig. 6【課題】１日の中で明期の太陽光の不足を補うように、植物に照射される光を調整することができる植物栽培システム、植物栽培方法、及びプログラムを提供する。【解決手段】植物栽培システムは、太陽光をあてて栽培する植物に対し、太陽光の不足を補うための第１光を放射する発光部９１と、発光部９１から第１光を放射させて補光し、植物に照射される太陽光と発光部９１からの光が所定量を超える場合に、発光部９１の発光量を低減させる制御部１４０と、を備える。【選択図】図６
