Abstract: Disclosed is a smart scheduler reflecting change of situation. The smart scheduler reflecting change of situation includes an interface unit and an alarm time decision unit. The interface unit both sends and receives contextual information to/from an external service-providing source. The alarm time decision unit reflects the contextual information that is received and updated from the external service-providing source, so that it may decide a final alarm time for performing a fixed schedule, even if any situation change occurs. The smart scheduler has the advantage that the determined schedule may be performed in the time in which a user designates, by differently setting up the alarm time according to the situation changes, whatever situation change brings about.