Patent ID: 7890920

Claim:
A computer-readable storage medium on which a program for executing a product purchase method using a computer network is stored, said program when executed by a computing device performs the steps of: updating, via said computer network, order sheet data stored in a database included in a server, wherein said order sheet data is order sheet data for each buyer; inhibiting the updating of said order sheet data after a predetermined date, wherein, until said predetermined date is reached, said order sheet data for each buyer is able to be corrected by respective buyers at any time via said computer network; aggregating said order sheet data of each buyer by summing up quantities of ordered products of all users to obtain aggregated data after said predetermined date; and fixing, as order data, said order sheet data for each buyer and said aggregated data after said predetermined date, wherein said ordered products are delivered to the respective buyers based on said order sheet data, wherein delivery confirmation data is stored in the database as information corresponding to the order sheet data for each buyer when buyers confirm deliver of said ordered products.