Abstract: A sales management device 20 is installed at the side of a manager (manufacturing company MC), who manages the sales of parts, and is connected via an intranet 11 to seller computers 31, 32, and 33, each of which is installed at the side of a selling company that sells the parts. This sales management device 20 is provided with a first data base part 23, which stores parts information, and a first control part 22, which transmits parts information to seller computers 31, 32, and 33, receives processed information resulting from the processing of parts information in accordance to dealers by seller computers 31, 32, and 33, and stores the processed information in first database part 23. By this sales management device 20, manufacturing company MC, which manages the sales of parts, can carry out unified management of the actual sales circumstances of the selling companies, and can thus readily grasp the levels of services provided by the sellers to the customers and consequently standardize the service level.

Abstract: Only information that has reached a disclosure day among information registered in a database of a first information providing server (32) having access through an intranet (10) is downloaded to a second information providing server (42) having access through the Internet (20), and the information is provided to clients (22 to 26) that are provided with access rights and that are connected to the Internet (20) from the second information providing server (42). As a result, information that has not reached the disclosure day can be prevented from being leaked by an illegal access to the second information providing server (42). The establishment of access rights makes it possible to hierarchize clients (12 to 16, 22 to 26) connected to the intranet (10) and to the Internet (20).