To produce a reformed gas from a refuse material to be incinerated, having high calorific value, usable without purification, generating decreased amount of CO2 in combustion and having excellent properties as a fuel.

Char 2 is produced by heating a refuse material in a refuse incineration facility 1 in an oxygen-deficient state, steam 3 is generated by using the waste heat of the refuse incineration facility 1, the char 2 is filled in a shaft furnace 5 and heated by passing electric current, the steam 3 is supplied to the shaft furnace 5 to produce a reformed gas 15 composed of carbon monoxide and hydrogen by water gas reaction and the produced reformed gas 15 is used as a substitution fuel 23 for fossil fuel or a fuel 25 for a fuel cell.