| 摘要 |
PROBLEM TO BE SOLVED: To provide a private wireless system that makes it possible to immediately perform safety confirmation using simple key operation in an emergency.SOLUTION: When a character message, which is related to safety confirmation and includes response possible number information and simple response control information, is transmitted from a character message server 200 to wireless terminal devices PS1 to PSn; users of the wireless terminal devices PS1 to PSn, when the response possible number information is made to be valid by the simple response control information, simply press down an operation key corresponding to the response possible number information to create and return a response message to the safely confirmation.SELECTED DRAWING: Figure 1 |
