An operation management apparatus comprising: a correlation destruction detection means for detecting correlation destruction which is a variance of a correlation between metrics of two different servers among a plurality of servers executed on one or more processing devices in a system; the correlation destruction of a correlation between two metrics being detected when difference between a prediction value of one of the two metrics acquired by inputting a measurement value of other of the two metrics into a correlation function of the correlation and a measurement value of the one of the two metrics is equal to or greater than a predetermined value, the correlation function being a function for predicting a value of one of two metrics from a value of the other of the two metrics; a configuration information generation unit for collecting an atrribute of each server in the system and for generating configuration information, and an evaluation value calculation means for calculating and outputting, 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, wherein the system includes a plurality of subsystems each of which is a group of one or more servers, the plurality of subsystems being independent from each other, the evaluation value calculation means is configured to calculate the evaluation value on the basis of the configuration information and whether subsystems to which the two servers with respect to the correlation on which the correlation destruction has been detected respectively belong, are the same or not, as the relation between the two servers, the evaluation value calculation means is configured to, in the case that the subsystems respectively including the two servers with respect to the correlation on which the correlation destruction has been detected are the same, calculate the evaluation value using a coefficient greater than a coefficient in the case that the subsystems are different, and the evaluation value calculation means is configured to output the correlation having the evaluation value being equal to or greater than a predetermined value among the correlations on which the correlation destruction has been detected between the servers. a correlation destruction detection means for detecting correlation destruction which is a variance of a correlation between metrics of two different servers among a plurality of servers executed on one or more processing devices in a system; the correlation destruction of a correlation between two metrics being detected when difference between a prediction value of one of the two metrics acquired by inputting a measurement value of other of the two metrics into a correlation function of the correlation and a measurement value of the one of the two metrics is equal to or greater than a predetermined value, the correlation function being a function for predicting a value of one of two metrics from a value of the other of the two metrics; a configuration information generation unit for collecting an atrribute of each server in the system and for generating configuration information, and an evaluation value calculation means for calculating and outputting, 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, wherein the system includes a plurality of subsystems each of which is a group of one or more servers, the plurality of subsystems being independent from each other, the evaluation value calculation means is configured to calculate the evaluation value on the basis of the configuration information and whether subsystems to which the two servers with respect to the correlation on which the correlation destruction has been detected respectively belong, are the same or not, as the relation between the two servers, the evaluation value calculation means is configured to, in the case that the subsystems respectively including the two servers with respect to the correlation on which the correlation destruction has been detected are the same, calculate the evaluation value using a coefficient greater than a coefficient in the case that the subsystems are different, and the evaluation value calculation means is configured to output the correlation having the evaluation value being equal to or greater than a predetermined value among the correlations on which the correlation destruction has been detected between the servers.