To reduce the time and effort required for a shop to update the display of information such as the prices of commodities to the newest one.

This commodity information display system is attached to each commodity or to a display rack for displaying the commodities, and includes an image display device and an IC tag. The IC tag comprises a price tag for receiving information sent by radio communication for display on the image display device and for displaying this information on the image display device, and a computer system that sends the commodity information for display on the image display device of each price tag to the IC tag of each price tag via radio communication.