For changing services to readers who desires to obtain electronic books exactly
or minutely, an electronic book management system 1 distributes at least
electronic purchase certificates relating to books which are stocked at a bookstores
owing a bookstore terminal device 2, in advance, to that bookstore terminal
device 2. When buying the book(s), a reader obtains in an IC card 4 owned
by her/him a purchase certificate(s) of that book(s) which she/he bought, from
the bookstore terminal 2. When ordering to obtain the electronic book(s),
the reader transmits the purchase certificate(s) from a reader terminal device
3 to the electronic book management system 1 through a communication
network 5. The electronic book management system 1 changes over it's
service when supplying the electronic book(s) to that reader depending upon the
existence of the purchase certificate(s).
