An image processing system includes: an image processing apparatus; a relay apparatus; and a service providing apparatus, which are connected to a network. The image processing apparatus includes: an electronic-file storage unit; an address-get-request transmitting unit; an upload-message generating unit which, upon receiving an upload destination address and a template for an upload message for performing an upload request to the service providing apparatus from the relay apparatus after a request for getting the upload destination address is transmitted to the relay apparatus by the account-information-request transmitting unit, generates the upload message including an electronic file and the upload destination address according to the received template; and an upload-message transmitting unit that transmits the upload message to the service providing apparatus to upload the electronic file to the service providing apparatus. The relay apparatus includes: a program storage unit; an upload-destination-address getting unit; and an upload-destination-address transmitting unit.