STATUS DETERMINATION OF A COMMUNICATION SYSTEM BASED ON PERFORMANCE INDEX VALUE DATA STORED IN A QUEUE

It is enabled that a status of a communication system is properly determined. A data bus (68) generates a queue in which performance index value data indicating a performance index value of an element included in the communication system is stored. An AI (70) and a policy manager (90) acquire, in response to the performance index value data being enqueued in the queue, a predetermined number of most recent pieces of the performance index value data or the performance index value data of a most recent predetermined period including at least latest performance index value data among the performance index value data stored in the queue, the number of pieces of performance index value data which is acquired being smaller than a maximum number of pieces of the performance index value data that is storable in the queue, and determine the status of the communication system based on the acquired performance index value data. The data bus (68) generates a file including at least part of the performance index value data stored in the queue at a frequency lower than a frequency at which the AI (70) acquires the performance index value data.