Combustion method and combustion apparatus

First, the nitrogen oxide emissions can be reduced to close to zero, the amount of carbon monoxide to reduce emissions within the allowable range, the second, the use of air close to a low combustion ratio of 1.0 to save energy, the third can be air ratio control stably in a low air ratio combustion region. Feature of the present invention is characterized by comprising: a hydrocarbon-containing fuel in the burner combustion without generating step comprising hydrocarbons containing combustion oxygen, nitrogen oxides and carbon monoxide gas; gas generated by the combustion step by endothermic device from an endothermic step of absorbing heat; after endothermic step of contacting the gas with an oxidation catalyst and carbon monoxide using the oxidation of oxygen contained in the gas by carbon monoxide, nitrogen oxides reducing harmful substances in the reducing step; the burner and the endothermic means the concentration ratio characteristics of the burner using the air-ratio adjusting device, the concentration ratio of the primary side of the oxidation catalyst, the gas is oxygen, nitrogen oxides and carbon monoxide, the concentration ratio is adjusted to a predetermined concentration ratio adjusting step.