provided are a method which can recycle waste by chemically treating unsaturated polyester resin waste resulting from manufacturing of buttons or waste of fiber reinforced plastic products containing glass fiber , for example , and obtaining industrially useful raw material , and an apparatus for carrying out the method . namely , unsaturated polyester resin waste is degraded with glycol , to obtain glycolic raw material . this degradation is preferably made under a pressure . it is possible to synthesize unsaturated polyester resin by reacting this glycolic raw material with unsaturated dibasic acid and saturated dibasic acid . it is also possible to synthesize polyurethane resin by reacting the glycolic raw material with a diisocyanate compound .