| 摘要 |
PROBLEM TO BE SOLVED: To inform a transmission side whether or not a reception side has surely received information in the case of sending the information from a transmission means to a reception means. SOLUTION: On the occurrence of a reception error when receiving information D1 sent from a transmission means 2 by reception means 5A-5Z, the received error information is sent to the transmission means 2 through a prescribed communication channel network 7 so as to allow the transmission means 2 to easily grasp an information communication state. Furthermore, on the occurrence of a reception error, the transmission means 2 sends information to the reception means 5A-5Z through the prescribed communication channel network 7 to surely send the information to the reception means 5A-5Z. |
