NOVELTY - Generating hydrogen gas by modifying organic waste supplied in the container comprises igniting some organic waste in the container; combusting by oxygen; ventilating and supplying water to the organic waste; raising temperature of water with the combustion heat by oxygen of organic waste; reacting water and organic waste; continuing ventilating, and supplying water; and generating hydrogen gas from organic waste.    USE - The method is useful for generating hydrogen gas by modifying organic waste supplied in the container (claimed).    ADVANTAGE - The method can modify continuously without using the energy from the outside in a regular reaction process. Moreover, the gas generated by the method contains high concentration of hydrogen.    DETAILED DESCRIPTION - enerating hydrogen gas by modifying organic waste supplied in the container comprises igniting some organic waste in the container; combusting by oxygen; ventilating and supplying water to the organic waste; raising temperature of water with the combustion heat by oxygen of organic waste; reacting water and organic waste; continuing ventilating, and supplying water, where the temperature of the combustion nucleus which is a hot section formed in center part of organic waste shall be 400 degrees C or less, the size is maintained to a fixed size, and organic waste is modified regularly; and generating hydrogen gas from organic waste. An INDEPENDENT CLAIM is an apparatus for modifying organic waste, comprising container for performing combustion and modifying organic waste; supply means for supplying organic waste to the container; temperature sensor for ascertaining the temperature of the organic waste during combustion in the container; gas introduction pipe for introducing external air into the container through the hole perforated by the surrounding wall part of the container; water supply means for supplying water to the organic waste which started the combustion, discharge means which discharges outside the modifying residue where modifying was performed from the container; and exhaust gas process means for discharging the gas of the container.