In an information processing apparatus which is connected to a Web server and includes a Web browser for displaying an operation screen provided by the Web server: a request is transmitted to the Web server on the basis of a user operation performed through the operation screen displayed on the Web browser; if it is requested by the Web server to perform a process on the basis of the transmitted request, the requested process is performed; if the process requested by the Web server is being performed, the transmitted request is not invalidated; and, if the process requested by the Web server is not performed, the transmitted request is invalidated according to that there is no response from the Web server and a predetermined time out period elapses after the transmission of the request.