To provide a construction method of a database and the like in which data representing realistic states of a user is accumulated. The database construction method includes the steps of: (a) acquiring, in real-time, first information which fluctuates in accordance with a state of a user, by using vital data acquiring means mounted to the body of the user or installed in a vicinity of the user； (b) acquiring one or more types of second information which differs from the first information； (c) analyzing a correlation between the first information and the second information； and (d) associating the second information with the state of the user based on an analysis result of the correlation.
