TIME SYNCHRONIZATION METHOD AND INFORMATION-PROCESSING DEVICE AND STORAGE MEDIUM FOR STORING TIME SYNCHRONIZATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To prevent wrong time setting, and to perform synchronization processing to autonomous standard time by allowing time synchronization only when an electronic signature is successfully certified, furthermore, and by prohibiting time setting before stored synchronization time. ;SOLUTION: A communication function part 4 periodically communicates with a time information supply program broadcasting source 1, and receives time information 2. A certification function part 5 receives the time information 2 from the communication function part 4, and certifies an electronic signature 7 being included in the time information 2. When certification is successful, the certification function part 5 transfers the time information 2 to a clock setting function 6. The clock setting function 6 sets a built-in clock 8 to time being included in the time information 2. When an information-processing device 3 performs processing in synchronization with standard time, a CPU 11 reads time from the built-in clock 8, and performs processing according to the time. As a result, the information processing device 3 can determine time in the real world, and can guarantee synchronization within required accuracy, thus preventing time from being wrongly set.;COPYRIGHT: (C)2000,JPO