1. An image evaluation apparatus that calculates an importance degree of each of a plurality of images including objects, the image evaluation apparatus comprising: a characteristic value calculating unit that calculates, for an object appearing in an image, a characteristic value indicating a state of appearance of the object; a photographer extracting unit that determines a photographer of the image and that calculates a likelihood degree indicating accuracy of the determination of the photographer; and an evaluation unit that calculates an importance degree of the image according to the characteristic value and the likelihood degree.