According to the method and apparatus of the present invention, when a non-flash image that is taken without a flash emitted before main photographing and a flash image that is taken with the flash pre-emitted before the main photographing are obtained so that an amount of flash emission light for the main photographing (amount of main emission) based on the obtained non-flash image and flash image, a moving body in the angle of view is detected. If the detected moving body is a main object, the amount of main emission is calculated based on the image of the moving body. If the detected moving body is not the main object, the amount of main emission is calculated based on the image other than the moving body.