An in-vehicle information display system includes a plurality of display devices each of which operates by receiving supply of alternating-current power obtained by converting power from a wiring or of direct-current power output from a power storage device and each of which performs guidance display to passengers, and a terminal device that operates by receiving supply of direct-current power from the power storage device and that distributes guidance display information used for the guidance display toward the display devices. The terminal device directly transmits the guidance display information to a part of the display devices, each of the display devices acquires the guidance display information from the terminal device either directly or via another display device, and the display device that acquires the guidance display information directly from the terminal device among the display devices operates by receiving supply of direct-current power from the power storage device.