System and method for processing message attachments

The stage of receiving the E-mail which was addressed by the data processing equipment with which data service has the specific throughput connected so that communication is possible and which holds the original attachment by data service, The stage of changing an original attachment into the format which data processing equipment can process based on specific throughput, から成る方法s are indicated to be the stage of receiving the E-mail answer of the purport that there is an intention including an original attachment, from data processing equipment, the stage of found out and re-attaching an original attachment, and a stage that transmits E mail message to an address with an original attachment.