1. An information processor comprising: circuitry configured to: detect an object in a plurality of individual regions of an image; generate a respective characteristic amount identifying a subject supported by each of the individual regions detected; generate a combined characteristic amount corresponding to the image, wherein the combined characteristic amount is generated by combining characteristic amounts for at least two of the subjects supported by individual regions having the largest relative size; and determine a label corresponding to a combination of subjects appearing in the image based on the generated combined characteristic amount.