To provide an advance ordering system which performs network mail-order sale by an anonym and a mail address and enables a user to receive a commodity after confirmation.

The system is provided with a means, which manages information correspondingly to the mail address of a member 10 and a URL of a network mail-order sales site 20, a means which adds the mail address to reservation order data D10 as data specifying the member, a means with which the network maxi-order sales site adds to order reception communication data D20 to transmit the mail address, a means which checks establishment of a reservation order on the basis of the mail address and information corresponding to the URL to generate and transmit customer discrimination codes D30 and D40 for member store and customer including tally codes D50 and D60, a means which adds tally codes to a commodity to send it to a place 40 of provision, a means which verifies tally codes there to transmit provision completion report data D70, and a means which transmits liquidation request data D80 to a banking organ 50.