An image processing apparatus for processing image data formed by a set of pixel data includes a real space filter processing unit and a color space filter processing unit, wherein the real space filter processing unit calculates a real space weighting coefficient and performs weighted average of pixel data according to filter processing of an edge preservation type; pixel data of at least a target pixel of pixel data used in the color space filter processing unit is pixel data calculated by the real space filter processing unit; and of the pixel data which the color space filter processing unit uses for the weighted average, the pixel data of the target pixel is pixel data calculated by the real space filter processing unit, and the pixel data of a peripheral pixel is pixel data forming the image data before being input to the real space filter processing unit.