1. An image quality adjustment information generation method that generates image quality adjustment information with regard to objective image data, which is laid out on a location of ornamental image data, said image quality adjustment information generation method comprising: obtaining the ornamental image data; analyzing the obtained ornamental image data to acquire an image quality characteristic of the ornamental image data, wherein the image quality characteristic of the ornamental image data includes statistical values of color components R, G, and B, and luminance; acquiring an image quality characteristic specification indicator for specifying a tendency of the image quality characteristic of the ornamental image data; computing a correction rate of the objective image data from the acquired image quality characteristic specification indicator and the acquired image quality characteristic of the ornamental image data, wherein the computed correction rate is used in the image quality adjustment for the objective image data, wherein the acquired image quality characteristic specification indicator is used in the computing the correction rate to realize the image quality adjustment for the objective image data in which the image quality of the objective image data is adjusted so that a tendency of the image quality characteristic of the objective image data is different from the tendency of the image quality characteristic of the ornamental image data; and writing the computed correction rate into layout control information, which is related to the ornamental image data and specifies a layout location and layout dimensions of the objective image data to be laid out on the location of the ornamental image data, wherein each operation of the image quality adjustment information generation method is executed by a processor.