To provide a network system device with which the reliability of dealer information can be improved by providing evaluation information about the providing source dealer of the dealer information in addition to the dealer information.

When a homepage requested by a Web client is the dealer information homepage of a dealer itself provided by the dealer related to construction, a Web server attaches user evaluation information 53 obtained by evaluating the dealer in five steps, i.e., 'cost' 53a1, 'technique capability' 53a2, 'speed' 53a3, 'support' 53a4 and 'quality' 53a5 and a business data inspection result display button 54 for displaying business data inspection results obtained in such a manner that an incorporated foundation construction information management center inspects the business state of the dealer to the homepage stored in a database area and offers the homepage to the Web client.