Image transmission device and image transmission method

An image transmission device, which is connected to such external devices as a facsimile, etc., via a public line and a computer network and can be operated in accordance with a request for image data transmission from the external device, includes a scanning section for scanning a document image and generating image data, a fax sending/receiving section for sending the image data to the external device by the request of the external device, a specific document judging section for judging whether or not the image data generated in the scanning section is that of a specific document, and a control section for controlling transmission of the image data by the fax sending/receiving section according to a result of judgment by the specific document judging section, thereby preventing the forgery of a specific document that is enabled by obtaining the image data of such specific documents as paper money, valuable securities, etc., scanned by the image transmission device or inputted from the outside to the image transmission device.