Even if an email attached with a moving image is sent to a terminal that is not capable of moving image display, pseudo moving image display can be carried out in high quality on the terminal. An email reception unit receives the email, and a model judgment unit judges the model of the terminal as a destination of the email. If the destination terminal cannot display the moving image, a moving image conversion unit generates a multimedia image data in a multimedia format from moving image data representing the moving image. An image attaching unit attaches the moving mage data or the multimedia image data to main content of the email, and an email transmission unit sends the image-attached email to the destination terminal.