[Object] To estimate lens information with no change in photographing conditions. [Solution] An image processing apparatus according to the present disclosure includes: a positional displacement estimation unit configured to estimate positional displacement between a plurality of input images obtained by photographing an identical photographic subject; an alignment processing unit configured to align positions of the plurality of input images on the basis of the estimated positional displacement; and a lens information estimation unit configured to estimate information of a lens used to photograph the input image depending on a model indicating a deterioration component of the lens on the basis of the aligned input images.