Fecha de publicación: -- Fuente: WIPO "tomato" A fuel consumption amount including heat transfer indexes of various lining covering materials in a calculation element is calculated, and energy-saving performance of a greenhouse is simulated. It is possible to, in both a case where the lining covering material is constituted of a single layer of one curtain member and a case where it is a multilayer curtain constituted of a plurality of curtain members, estimate the fuel consumption amount using their heat transfer indexes, grasp a reduction amount of fuel consumption and a reduction amount of greenhouse effect gas caused by the selected curtain member or multilayer curtain, visualize the energy-saving performance, and select the lining covering material more excellent in the energy-saving performance.