Settlement terminal system and information relay method

A settlement terminal system comprising:

• a settlement terminal apparatus which is capable of being connected to a host server;
• and
• a first card information input device which is connected with the settlement terminal apparatus and accepts card information and transmits the card information to the host server through the settlement terminal apparatus;
• wherein the first card information input device comprises:
• a decryption unit which decrypts the card information encrypted by a first encryption technique;
• a first input part to which the card information is inputted by an operation of a user;
• and
• an encryption unit which encrypts the card information inputted to the first input part and the card information decrypted in the decryption unit by using a second encryption technique different from the first encryption technique;
• and
• the settlement terminal apparatus comprises:
• a first transfer unit which transfers the card information encrypted by the first encryption technique to the first card information input device;
• and
• a second transfer unit which receives the card information encrypted by the second encryption technique from the first card information input device and transfers it to the host server as it is.