1. A network system comprising: a client for browsing web pages; a server for providing a function to perform a predetermined process for said web pages; and a web server for storing a web page that includes a function execution request object which is used to request that a process be performed by said function providing server, wherein said client obtains, from said web server, said web page that includes said function execution request object, and when said function execution request object included in said web page is selected, said client designates the storage location for a target web page and transmits a process execution request to said function providing server, wherein, upon the receipt of said process execution request from said client, said function providing server obtains said target web page based on said storage location that is designated by said process execution request, performs a pertinent process for said target web page that is obtained, and returns the resultant web page to said client that issued said process execution request.