To provide a processing apparatus and a processing method, which enable more efficient processing of water-containing organic matters and a powder body manufactured thereby. A processing apparatus 10 stirs the water-containing organic matter stored in a processing tank 12 with a stirring unit 14 and heats an interior of the processing tank 12 by a heater 72. At the same time, the processing apparatus 10 exhausts gas from the processing tank 12 by an exhaust unit 61 at a rate ranging from 1 m3/min to 300 m3/min, and along with the exhaustion, supplies ion gas having an ion density of 2,000,000 pcs/cc or higher from an ion gas supply unit 15 to the processing tank 12 to process the water-containing organic matters.
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