A business form generating server generates a business form page by overlaying form information and field data. The business form generating server generates data for displaying a browsing screen on which the business form page is browsed and edited. A client apparatus adds attribute information to information for a field of the business form page based on the data, wherein the attribute information includes layout information. If the information of the field of the business form page is edited by using the browsing screen, the client apparatus determines whether or not overlaying again is necessary based on the attribute information which is added to the information of the edited field.