A push type scanner apparatus according to the present invention can transmit image data read by the push type scanner apparatus through a network to a desired personal computer only by operating the push type scanner apparatus without transmitting any operation command from the personal computer. In the push type scanner apparatus, for transmitting image data, a destination address is specified; a mail to be transmitted to the specified destination address is created; an appended file comprising the image data read by the scanner apparatus and appended to the mail is created; and the created mail and appended file are outputted to the network.