By using a support program for a web application server according to the present invention, it is possible to completely control an order of executing processes of a processing flow including a transition of a plurality of screens in a web application by a side of the server, and to describe the processing flow as “one unit of executable program code”. Also, it is possible to record, point by point, respective items or the like of an entry form included in an HTML document to be sent to a client in the server as a form ledger, compare and verify the respective items with the items in the form ledger at the time of receiving input data corresponding to the entry form from the client, and thereby to automatically discard an unauthorized input or the like without depending upon the application program, by using the support program for the web application server.