Abnormality can be judged accurately by considering information other than
a sensor-detected value. Determination of an abnormality degree, namely an
urgency degree, is enabled, and an abnormality can be processed accurately
according to the determined result. Only information really useful is
given to the side of an administrator, and the communications cost is
suppressed. Server unit 11 of manufacturer 10 judges the abnormality
degree of a construction machine on the basis of a combination of all or
two of first to third construction machine information D1, D2, D3
collected. The server unit 11 of the manufacturer 10 ranks the abnormality
degree of the construction machine in respective levels of Rank 1
(Normal), Rank 2 (Warning), Rank 3 (Abnormal) and Rank 4 (Emergency) on
the basis of the number of occurred times of error codes collected for the
unit time.
