1. An image processing apparatus comprising: a feature amount recognition unit that recognizes a feature amount of each of a plurality of image data; and a processing reference extraction unit that extracts a processing reference for image correction to be made to the plurality of pieces of image data from the feature amount recognized by the feature amount recognition unit, wherein the feature amount recognition unit recognizes an image quality containing at least any one of lightness, contrast, saturation, hue, and sharpness of each of the plurality of pieces of image data as the feature amount, and wherein the feature amount recognition unit further including a target value setting unit that generates an average of the feature amount to be used as a target value to which the main subject are adjusted, wherein the image processing apparatus further includes a background processing unit that unifies a background color of each of the plurality of image data under a majority rule of the background color of each of the plurality of image data.