In an image network system used for network print service which receives an order for printing or the like by using a communication network such as the Internet, there are provided a center server capable of providing service which is different depending upon points given to a customer according to an order track record, at a time of using the system, capable of suitably setting a storage capacity and a storage period of an image for a user without placing a burden on the user while importance is placed on an operational efficiency of the system, capable of allowing a user to upload images as many as possible in an album, and useful for prompting an order, and an image network system including the center server.