An image forming apparatus including a communication circuit configured to establish proximity communication with a biometric authentication apparatus, a display, and a processor configured to perform authentication processing with biological information detected by the biometric authentication apparatus is provided. The processor is configured to carry out control for reducing a quantity of light output from the display and incident on the biometric authentication apparatus during detection of the biological information by the biometric authentication apparatus when the processor receives information representing optical detection of the biological information by the biometric authentication apparatus from the biometric authentication apparatus through the communication circuit.