| 摘要 |
PROBLEM TO BE SOLVED: To make determination that there may be a possibility of abnormality if positional information of a person to be watched is acquired by GPS and the positional information does not satisfy determination conditions which are substantially consisting of logical conditions by a plurality of time zones and a plurality of areas preset by the person to be watched. ! SOLUTION: A watch system 1 determines a possibility of abnormality based on positional information of a GPS terminal 50 owned by a person to be watched 51. A watch server 10 includes: a setting DB 18 for retaining an area where the person to be watched 41 can exist and information of existence determination conditions in the area for each time zone of the person to be watched; a position acquisition part 11 for periodically acquiring the positional information from the GPS terminal 50; and a safety determination part 12 for determining whether the person to be watched 51 currently exists in the area where the person to be watche |
