To solve such problems caused by discharging hydrogen sulfide associated with collecting underground hot water and steam, such as atmospheric pollution, pollution of rivers, soil contamination, ground subsidence, noise by exhalation, and decrease in volume of hot spring in hot spring resorts or the like.

A pillar (pile) made of metal with excellent heat resistance and corrosion resistance and concrete ceramics or the like is connected to a heat source and fixed between the heat source and the ground, and a pillar (pile) made by fully considering insulation and heat conductivity is extended to the ground to secure the heat source. The problems are solved because hot water and steam are not collected, and miniaturization of plants or the like which use geothermal heat, reduction in construction work, and reduction in lead time are also achieved.