1. A portable terminal, comprising: a storage circuit including an area storing image data; a communication circuit that ensures data communication with a scanner, the scanner reading a document image and generating scanned image data; a reading instruction circuit that instructs the scanner to read the document image; a target-selection accepting circuit that accepts selection of target image data from the image data inside the storage circuit; a scanned-image data acquiring circuit that acquires the scanned-image data from the scanner, the scanned-image data being generated by the reading of the document image by the scanner; and a combined image data generating circuit that generates single combined image data with a plurality of pages by combining the scanned image data with the target image data, and acquires the combined image data instead of the scanned image data.