An information input apparatus is constituted of an operation panel that inputs various types of information and an operation panel board that controls the operation panel. The operation panel includes an LCD that is the displaying unit that displays the information input screen for inputting various types of information, and a touch panel that is the input instructing unit that executes an input instruction from an input region (virtual keys) provided on the information input screen. The LCD displays on the virtual keys information different from information previously assigned to the virtual keys on the information input screen.