To provide a communication terminal, such as a facsimile machine, that can attach advertisement image to an original image.

The communication terminal 1 with an advertisement transmission function is provided with an advertisement size setting means, that sets the size of advertisement attached to original image data, an advertisement image size setting means that sets the size of advertisement image data to be attached, an image registration means that magnifies or reduces the advertisement image data, so that the size of the advertisement image is almost equal to the size of the advertisement and registers the result as registered image data, an image attachment means that attaches the registered image data to the original image data to obtain attached image data, and a transmission means that transmits the attached image data to a communication line.