A computer-readable, non-transitory medium stores therein an operation management support program that causes a computer to execute a process that includes acquiring execution history information recording for each element group included in activity diagrams expressing work procedures for operation processes executed by a system, correlations between elements and access destinations thereof; searching among elements not yet selected from among all element groups, for a second element having an access destination coinciding with that of a first element selected from among all element groups, the searching performed by referring to the acquired execution history information; setting the first and the second elements as synonymous elements, if a second element is retrieved at the searching; extracting from among the element groups included in the activity diagrams including synonymous elements, a common element string of elements common among the activity diagrams that include the synonymous elements; and outputting the extracted common element string.