1. Control apparatus for enabling a user to communicate by speech with processor-controlled apparatus having a display for displaying screens to a user, an audio input means for receiving speech data from the user and a position data providing means for providing data for enabling the screen location at which the user's attention is directed to be determined, the control apparatus comprising: screen data providing means providing screen data for a display screen, the screen data including access data, location data defining a location within the screen associated with the access data and speech input data for enabling a user to formulate a spoken command or commands to initiate use of the access data; screen data display control means for causing the display to display a screen representing the screen data to the user; location determining means for determining from position data provided by the position data providing means the screen location at which the user's attention is directed; and prompt means for, when the determined location corresponds to the location defined by the location data, using the speech input data to provide the user with a prompt to assist the user in formulating a spoken command that initiates use of the access data.