1. An image control apparatus configured to input a plurality of image data associated with a plurality of broadcast programs and to display a plurality of images based on the plurality of image data in a multi-screen display mode, the image control apparatus comprising: a processor; and a memory coupled to the processor to store instructions that, when executed by the processor, cause the processor to perform operations comprising: reading out a table indicating image quality adjusting parameters corresponding to a plurality of predetermined program genres; determining respective image qualities of the plurality of images based on a combination of program genre of the plurality of images displayed in the multi-display mode, so as to reduce a difference of image qualities between the plurality of images according to the combination of program genre of the plurality of images; and processing the plurality of image data to cause the plurality of images to have the determined respective image qualities, wherein an image quality adjusting parameter corresponding to a program genre of a sub image displayed in the multi-screen display mode differs dependent on a program genre of a main image combined with the sub image.