An operation management device includes a collecting unit to receive management data of elements provided in a plurality of management target devices, an analyzing unit to obtain a dependency relation of problematic data defined as data of devices with occurrence of the problem in the received management data according to definition information which defines a dependency relation between the elements and to obtain a dependency relation of non-problematic data defined as data of the devices with non-occurrence of the problem in the received management data according to the definition information, and a comparing unit to obtain management data of a common element by comparing the problematic data with the non-problematic data and to extract a difference between the problematic data and the non-problematic data with respect to management data of elements dependent on the common element.