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摘要

The present invention provides a method for determining access of a certain region which is accurate and reliable in the inside of buildings or underground difficult to determine a current location. The present invention provides a system for two users (child-guardian, dotard-guardian, and employee-employer) who use a smart device. The system provides information to a user 2 that a user 1 enters and exits the certain region set by the user 2. For example, the system and the method provide the information for notifying time information that the user 1 enters and exits a house, a piano institute, an English institute and an office set by the user 2 and determining a site located at a certain time. Also, the present invention includes the method which determines that the user 1 enters and exits the certain region.