| 摘要 |
PROBLEM TO BE SOLVED: To provide an information broadcast method which can secure the stability when the information is transferred between an information center and an information terminal. SOLUTION: The contents of the answer signals S30 which are sent to the information centers 3 and 22 from an information terminal 9 are sent to the terminal 9 from the centers 3 and 22 as the confirmed information. Under such conditions, the confirmed information is ciphered according to a method which can be decoded only at the information terminal serving as a sending destination. Thus, the safety is secured when the information is transferred between the centers 3 and 22 and the terminal 9 respectively. |
