1. An information processing apparatus comprising: an operating section configured to receive an operator's entry of command; an image data acquisition section configured to acquire, from an Internet site, image data represented by a command to acquire the image data as a print target, in which an entry of the command has been received by the operation section; 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 search, from the image data acquired by the image data acquisition, for predetermined size-related word, extract characters situated next to the word and indicated by a combination of numerals and unit symbol, and acquire the extracted characters as 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, wherein the output target image specifying section comprises: a template acquisition section configured to acquire, from a web page on Internet, an image concerning a keyword as a template for use to extract the output target image, in which an entry of the keyword has been received by the operation section; a pattern matching section configured to subject the image data acquired by the image data acquisition section to pattern matching using the template; and an image extracting section configured to extract an image determined to have a consistency with the template by the pattern matching of the pattern matching section and specify the extracted image as the output target image, and the actual size acquisition section is further configured to acquire as the actual size information pieces of actual size information on dimensions of the output target image in width, height, and depth directions, and the image processing section is further configured to enlarge or reduce the output target image in the width, height, and depth directions and, in the absence of the piece of actual size information on the dimension in one of the width, height, and depth directions, use a predetermined image to create a portion of the output target image in the one direction in which the piece of actual size information on the dimension is absent.