| 摘要 |
PROBLEM TO BE SOLVED: To overcome such a problem that a center would go down if the number of terminals becomes very large and multiple abnormality occurs at the same time. SOLUTION: This system is equipped with subcenters 2-0 to 2-M which are provided at terminal groups 1-0-0 to 1-0-N0 to 1-M-0 to 1-M-NM respectively among many terminals 1-0-0 to 1-M-NM and generate abnormality notice mail 54 by simplifying pieces 4-0 to 4-M of sub abnormality notice mail received from the terminal groups 1-0-0 to 1-0-N-0, 1-M-0 to 1-M-NM, etc., through subnetworks 3-0 to 3-M and send the abnormality notice mail 54 to a center 52 through a network 53.
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