A control apparatus for enabling a user to communicate by speech with a processor-controlled apparatus, 1) controls a display of text data which includes a speech link that can be activated by a spoken command, 2) determines the location of a cursor displayed on a display from gaze input information, 3) changes a shape of the cursor when the cursor is located over the speech link, and 4) outputs a prompt identifying speech commands that can be used to activate the speech link when the cursor is displayed on the display in a changed state for a predetermined time located over the speech link.