An image processing apparatus includes an input processing unit which generates image data and attribute data indicating an attribute of each pixel of the image data from inputted data, a first data compression unit which compresses the image data generated by the input processing unit, a second compression unit as a lossy data compression unit to compress the attribute data generated by the input processing unit, a first expansion unit which expands the image data compressed by the first data compression unit, a second expansion unit which expands the attribute data compressed by the second data compression unit, and an output image processing unit which processes the image data expanded by the first expansion unit with a process condition for the attribute data expanded by the second expansion unit to output the image data expanded by the first expansion unit as image data with predetermined data characteristics.