To reduce the traffic of a network that is caused in the transmission of an electronic mail having the additional binary data by analyzing the file information on the received electronic mail and performing the file access control to a designated file server.

An electronic mail processing part 11 of an electronic mail service manager 5 receives an electronic mail from an electronic mail client 1 and then reads, interprets and processes the file transfer command script added to the received electronic mail via a file transfer command script processing part 12. Then the part 11 receives the file transferred from the client 1 via a file transfer processing part 13. The data file transferred from the client 1 is stored in file server disk 6 that is designated separately from the ordinarily electronic mails and undergoes the access control only via the part 13.