To provide a processing method for remarkably reducing thermal energy cost (electricity and fossil fuel) necessary for drying/crushing/sterilizing processing and deodorizing an odor gas, in the used paper diaper drying/crushing/sterilizing device, and remarkably reducing costs of entrustment of transportation to the outside of facilities by processing the paper diaper fuel inside the facility.

A hybrid boiler using used paper diaper and waste oil as the fuel, is provided on the side of a tank for drying, crushing and sterilizing the used paper diaper. As the hot air necessary for the drying, crushing, sterilizing and deodorizing processing, hot air and a combustion gas of the hybrid boiler are utilized. Thus energy cost can be remarkably reduced in comparison with the energy cost of a conventional electric heater, or a hot air generating device using fossil fuel and a catalyst deodorizing device.