The present invention includes a receiver capable of receiving confidential data, a screen display controller that performs a control that displays a screen in which the confidential data received by the receiver is in a masked display, a determiner that determines whether or not an identification display for visualizing the confidential data in the masked display is to be displayed, and an identification display controller that performs a control that displays the identification display on the screen when it is determined by the determiner that the identification display is to be displayed.