1. An information display apparatus comprising: video reproduction means, adapted for connection to a storage medium having data recorded thereon representing a plurality of map frames of different scales, for producing first video signals representing a selected one of said plurality of map frames; graphic generator means for generating, from prestored overlay information in digital form, second video signals representing an overlay image; means connected to said video reproduction means and said graphic generator means for combining said first and second video signals; and control means connected to said graphic generator means and including means for storing information representing said overlay image, said control means for selecting, in response to information indicative of the geographical area covered by, and the relative scale of, (a) said selected map frame, overlay image information stored by the overlay information storage means corresponding to said geographical area and for controlling the graphic generator means to display the overlay information at the same scale as the map frame.