In an information display apparatus such as a head-up display, while safety is being secured, visibility from a user is improved. Image data having an object such as an arrow showing an advancing direction or a road sign drawn on it are generated as information to be given to the user by a display information generating section 12 and is output to a projector 13. When a light beam R1 corresponding to the image data is emitted from the projector 13 to a combiner 14, reflected light of the light beam R1 and transmitted light of external light R2 are combined in the combiner 14, so as to be viewed by the user. At this time, the display information generating section 12 outputs coordinate values showing a display position of the object to a transmittance control section 16, and the transmittance control section 16 specifies a display region of the object based on the coordinate values, and reduces the transmittance in the specified region of the light control panel 15 so as to reduce a transmitting amount of the external light R2.