| 摘要 |
<p>PROBLEM TO BE SOLVED: To allow the sequence of occurrence of events to be correctly held even when a system clock loses time.SOLUTION: An information management device includes: a clock unit which clocks the time of the information management device as a system time; a storage unit in which a history time corresponding to a time stamp being a time characterizing the occurrence of an event, a difference time characterizing the difference between the history time and the system time, and history information associating information of the event and the history time with each other are stored; and an information management unit which, on the occurrence of the event, acquires the history time and the difference time as a read history time and a read difference time, respectively, from the storage unit, acquires the system time from the clock unit, calculates the history time of the event as a new history time and, if the new history time is earlier than the read history time, uses the system time and the read difference time to calculate the history time as a corrected history time.</p> |
