An information display system comprising a tag including a signal receiver, an image-memory-type display medium that displays a display image based on an image display signal, and a storage including a first storage region for storing identification information and the image display signal and a second storage region for storing recording information indicating a storage state of the image display signal in the first storage region; and a reader/writer including a contact electrode unit that contacts the signal receiver, an information recognition unit that reads the identification information and the recording information, a memory that stores image display information corresponding to the identification information and identification information, and a writing unit that transmits an image display signal based on the image display information and a write signal for changing the recording information to indicate that the image display signal has been stored through the contact electrode unit.