An apparatus includes pixels each having a transistor that transfers a charge of a photoelectric conversion unit, an amplification unit that receives the transferred charge, a scanning unit that supplies, to the transistor, a conductive pulse, a non-conductive pulse, and an intermediate-level pulse having a peak value between the conductive pulse and the non-conductive pulse, a generating unit that generates an image signal using a signal based on a charge transferred in response to the conductive and intermediate-level pulses, and a control unit that changes at least one of a pulse width of the intermediate-level pulse and the peak value in accordance with information on the detected temperature. The conductive and intermediate-level pulses are supplied to the transistor during a light shielding period of the photoelectric conversion unit.