To enhance an object and to make the object inconspicuous by adjusting contrast of a particular object in an image.

An object histogram calculating part 9 extracts a first object 5 and a second object 6 included in an image 12, calculates luminance histograms 7 and 8, operates an object γ correction coefficient calculating part 11 to correct a γ curve on the basis of any one or more among distribution contents of the luminance histograms 7 and 8, average luminance, maximum luminance, and minimum luminance, and operates an object gradation correcting part 13 to apply γ correction processing to the first object 5 and the second object 6 on the basis of an object γ correction coefficient after calculating the object γ correction coefficient.