1. An information processing apparatus comprising: an image data acquisition section configured to acquire image data; an output target image specifying section configured to specify, from the image data acquired by the image data acquisition section, an output target image to be output; an image size calculating section configured to calculate an image size of the output target image based on a magnitude of a region where the output target image exists in the acquired image data; an actual size acquisition section configured to acquire, from the acquired image data, actual size information indicating an actual size of the output target image; a ratio calculating section configured to calculate a ratio of the calculated image size to the actual size indicated by the actual size information acquired by the actual size acquisition section; an image processing section configured to enlarge or reduce the image size of the output target image according to the ratio calculated by the ratio calculating section; and an output section configured to output the output target image enlarged or reduced by the image processing section.