1. A reader device reading information from an information storage medium, wherein the information storage medium includes an IC chip executing a command transmitted from the reader device; and the reader device comprises: a command communication section transmitting the command to the information storage medium and receiving a response signal from the information storage medium obtained as a result thereof; a storage section storing feature points of the IC chip, and a genuine/counterfeit judgment section extracting the feature points from the response signal from the information storage medium and judging whether the IC chip is a genuine or counterfeit one on the basis of the extracted feature points.