To efficiently input information into an electronic mail by retrieving appropriate distributed information from a storage means according to searched customer information, and receiving and inputting the retrieved distributed information into the electronic mail.

When an electronic mail is sent from a customer B to a customer A and received by a mail server 1, the mail server 1 extracts the header part of the received mail. Then the mail address of the customer A in the extracted header is analyzed. Then customer information stored in a storage device 1b is retrieved according to the analyzed mail address to obtain customer information on the customer A. On the basis of the customer information on the customer A, retrieval from a storage device 1c is performed to obtain distributed information to meet distribution conditions. The read-in distributed information is inputted into the mail, which is saved. When there is no distributed information meet the distribution conditions, the mail is saved as it is.