To enable to perform access to a mail server 100 with an internal network from an internet.
A relay server 100 being accessable to the mail server 100 with a gateway for executing access control to the internal network is provided in the internet, the cipher key of a usage terminal 120 is previously inputted to the mail server 100, the transfer condition of the electronic mail is also previously given, the mail server 100 extracts the electronic mail 107 of a storing part 101 at the time of the transfer condition, the extracted electronic mail 107 is ciphered(103) so as to be transferred to the relay server 100 and it is stored in the storing part 111. The terminal 120 transmits authenticating information with the server 100 and an electronic mail reading request to the server 100 and the relay server 100 extracts the corresponding electronic mail(113) so as to transfer it to the terminal 120. The terminal 120 decodes the electronic mail(121) and displays it in a display part 122.
SHIMIZU AKIHIRO
TODA MASAHIRO
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