An image processing apparatus including: a pixel array section in which unit pixels, each having a photoelectric conversion element, are two-dimensionally arranged in a matrix; and a signal processing section determining a signal level by any one of a water gate mode determining the signal level in accordance with a first amount of electric charge based on an electric charge accumulated in the unit pixels, the electric charge more than or equal to a prescribed accumulated electric charge, in a first exposure period or a second amount of electric charge based on all the electric charges accumulated in the unit pixels in a second exposure period including the first exposure period and a multiple exposure mode determining the signal level in accordance with a plurality of amounts of electric charge based on all the electric charges accumulated in the unit pixels in a plurality of exposure periods.