| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide continuous service by properly determining the life of a battery and replacing a wireless tag at a proper time. <P>SOLUTION: A management server 10 communicating with a battery built-in ID card 20 connected through a radio communication network, estimates the life of the battery of the ID card 20 based on the accumulated operation time from the operating start of the ID card 20 or the number of communication operations with the ID card 20. <P>COPYRIGHT: (C)2010,JPO&INPIT |
