a method for smelting and reducing iron ores comprises the steps of : the step of preheating and prereducing iron ores ; the step of charging the preheated and prereduced iron ores into a smelting reduction furnace ; the step of charging carbonaceous material and fluxing material into the smelting reduction furnace ; the step of blowing in oxygen gas into the smelting reduction furnace through a top - blow oxygen lance having decarbonizing nozzles and post combustion nozzles ; and the step of blowing in stirring gas through side and bottom tuyeres set respectively in a side wall and a bottom of the smelting reduction furnace . furthermore , an apparatus for smelting reduction fitted for the method comprising : a preheat and prereduction furnace preheating and prereducing iron ores ; a smelting reduction furnace into which iron ores , carbonaceous material and fluxing material are charged and in which the iron ores are smelted and reduced ; a top - blow oxygen lance through which oxygen gas is blown in into the smelting reduction furnace , having decarbonizing nozzles and post combustion nozzles ; and the smelting reduction furnace having bottom and side tuyeres built respectively in a side wall and a bottom thereof .