In a fixing apparatus having a first roller which includes a first heater and a second heater arranged in difference ranges from each other in the direction of rotation axis and an auxiliary heater arranged in a range including the ranges where the first and second heaters are arranged in the direction of rotation axis, and a second roller which is heated by a third heater and nips and carries a sheet in cooperation with the first roller, predetermined timing accompanied by start of fixing processing in the fixing apparatus is determined, and when it is determined that the predetermined timing has been reached, the quantity of power supply to the third heater is reduced and power supply to the auxiliary heater is started.