1. An operations management system, comprising:a memory configured to store program instructions and a plurality of analytical models respectively used for detection of anomaly in a plurality of targets; and
a processor configured to execute the program instructions including:
an order controller configured to control a processing order of the detection of anomaly for the plurality of targets performed by the operation management system to be the same as a descending order of score of anomaly of the plurality of targets;
an analyzer configured to detect, in the processing order, anomaly in each of the plurality of targets; and
a countermeasure executor configured to execute countermeasure for the anomaly on the target in which the anomaly is detected, wherein
the order controlled is configured to update the processing order for the plurality of targets, per each period of time, and
the analyzer is configured to detect anomaly for the plurality of targets, per each period of time,
wherein the order controller is configured to, in a case that the detection of anomaly has not been performed for one of the plurality of targets within a period of time, update the processing order using the score increased for the one of the plurality of targets.