Patent ID: 7555651
Filing Date: 2009-06-30
Classification: G04R,G06F

Abstract:
1. A time management method comprising: an external time fetching step for fetching an external time within a predetermined time span; a local clock step for outputting a self-advance time; and a time difference judgment step for calculating a difference between the external time fetched by the external time fetching step and the self-advance time output by the local clock step, setting the external time to the local clock step in a case where the difference is less than a predetermined value, and not setting the external time to the local clock step in a case where the difference is equal to or greater than a predetermined value; wherein in a case where the external time cannot be fetched within the predetermined time span in the external time fetching step, the predetermined time span is extended and the fetching of the external time in the external time fetching step is continued.