The woods that can be recycled as raw materials are used for raw materials for plywood production by selecting woods that are dumped such as waste furniture or wasted woods that are dumped from each home or place of business, thinning-out trees, branches of street trees, floating plats and trees on reservoir or dams and all others, and the woods impossible for recycling are used for fuels and converted into energy to supply to industries so that there is no dissipation of precious resources.