1. A composite photograph creation system which creates a composite photograph by pasting a user image at a plurality of previously determined user image combination positions on a template image, the system comprising: a combination position mail address that is individually set for each of the plurality of the user image combination positions, a mail creation device which creates an electronic mail with information of the combination position mail address stated in mail text, sending device which sends the electronic mail created with the mail creation device to a user mail address which is the mail address of the user, a user terminal which receives the electronic mail sent from the sending device to the user mail address, and individually sends second electronic mail to which a user image is attached, to the combination position mail address stated in the mail text of the electronic mail; a reception device which receives the electronic mail sent from the user terminal to each combination position mail address; and a composite photograph creation device which creates the composite photograph by pasting the user image attached to the electronic mail received by the reception device, at one of the user image combination positions, in accordance with a destination mail address of the received electronic mail.