Abstract: An operation management apparatus includes a correlation destruction detection unit and an evaluation value calculation unit. The correlation destruction detection unit detects correlation destruction on a correlation between metrics of two different server among a plurality of servers executed on one or more processing devices in a system. The evaluation value calculation unit calculates and outputs, when correlation destruction on a correlation between two servers has been detected for inputted measurements of metrics, an evaluation value of the correlation destruction on the basis of a relation between the two servers with respect to the correlation on which the correlation destruction has been detected in the system.