Abstract: In an integrated circuit apparatus made up of three or more integrated circuits which are supplied with power from three or more power supply sources that can be subjected to individually-controllable shutoff and which are sequentially subjected to interruption of power supply, control of a power shutoff circuit inserted into a signal line between integrated circuits is facilitated without regard to the physical layout of integrated circuits. A power shutoff control signal is imparted to a power shutoff circuit which is inserted into a signal line for interconnecting integrated circuits and which controls an output from a power shutoff circuit to a fixed state during shutoff of power to a connection-target integrated circuit. Accordingly, the integrated circuits are selected in sequence of interruption of power supply.