An image transmitting apparatus according to the invention is configured such that destination-identifying information and a data format of the image data are registered, in one set, in a one-touch transmission key so that, by operating the one-touch transmission key, the image data can be transmitted to the intended destination in the predetermined data format. Moreover, in the image transmitting apparatus of the invention, it is possible to perform image transmission via a first transmission route, e.g., for electronic mail which accepts a plurality of file formats, and image transmission via a second transmission route such as an Internet FAX route which accepts a predetermined file format only, and, in registering destination-identifying information together with a corresponding file format in a one-touch transmission key, the predetermined file format is set when the second transmission route is set as a transmission route.