1. An information processor, comprising: circuitry configured to: detect a plurality of individual regions of an image, wherein each of the plurality of individual regions supports one of a plurality of subjects of the image; generate a respective characteristic amount for each of the plurality of individual regions detected, wherein the characteristic amount is generated based on one or more of positional information of a respective individual region and an area of the respective individual region; generate a combined characteristic amount that corresponds to the image, wherein the combined characteristic amount is generated based on a combination of the characteristic amounts for at least two individual regions having largest areas among areas of the plurality of individual regions; and determine a label that corresponds to a combination of the subjects supported by the at least two individual regions, appearing in the image, based on the generated combined characteristic amount, wherein the image is a cooked food image having a cooked food as the subject supported by each of the plurality of detected individual regions, and the circuitry is further configured to detect individual plates in the cooked food image as the individual regions.