a fixing apparatus includes a fixing device having a heating roller which rotates and a press roller which rotates in tight contact with the heating roller , and adopted to heat and press a medium with an unfixed image by passing the medium between the rollers , thereby fixing the unfixed image , a detection device which detects temperatures of the heating and heating rollers , and a control device which variably controls rotating states of the heating and press rollers based on the temperatures detected by the detection device .