Abstract: A discount sale management apparatus has a discount rate registration unit, a selling price setting unit, a product information and price provision unit, and an order receipt unit. The discount rate registration unit receives and registers discount information about product discount sale from a seller over a network N. The selling price setting unit counts a sales quantity; while the sales quantity is less than a planned discount sales quantity, sets a discount price produced by discount from an original price as a selling price, based on the discount information; and after the sales quantity reaches the planned discount sales quantity, sets the original price as the selling price. The product information and price provision unit provides a selling price set by the selling price setting unit to a purchaser over the network. The order receipt unit receives purchase orders from the purchaser.

Abstract: A sale device is connected to the terminals of a purchaser and a seller, respectively, via a network. The sale device comprises a work information acquisition unit, an information provision unit, a payment confirmation unit and a purchase information acquisition unit. The work information acquisition unit receives sale consignment per units of rights of a literary work from a seller via a network. The purchase information acquisition unit sells a literary work to a purchaser per units of rights via the network and the unit obtains information about the purchaser at the time of purchase. When the payment conformation unit confirms the payment of a purchase price, the information provision unit provides the information about a purchaser via the network. Any person can read this provided information via the network.