An information display system comprising a tag including a signal receiver, a data code, and an image-memory-type display medium that displays an image based on an image display signal; and a reader/writer including a contact electrode unit that contacts the signal receiver, an information recognition unit that recognizes the data code and the display image, a memory that stores image display information corresponding to information included in the data code and information of a data code, and a writing unit that transmits an image display signal based on the image display information through the electrode unit. The recognition unit reads and compares the information included in the read data code with the information of the stored data code, and when identical, the writing unit transmits the image display signal through the electrode unit to display the image on the display medium, which is checked by the recognition unit.