7. The configuration information management apparatus according to claim 5 , wherein the history synchronization counter unit changes setting of timing of the operation history or setting of the setting number of times, depending on a type of the attribute item of determination target.
5. The configuration information management apparatus according to claim 1 , further comprising: an operation history management unit that stores therein operation histories of the configuration items and the attribute items in the data management unit; and a dictionary candidate management unit that stores therein the dictionary candidates retrieved by the dictionary candidate retrieval unit, wherein the dictionary generation unit includes a history synchronization counter unit that acquires the operation history of each of the dictionary candidates being managed by the dictionary candidate management unit at the same timing of the attribute items of the corresponding dictionary candidate, determines whether data are synchronized in the operation histories of the attribute items, and counts the number of times of history synchronization when the data are synchronized, a dictionary candidate selection unit that selects the dictionary candidate of a dictionary target from the dictionary candidates being managed by the dictionary candidate management unit based on the number of times of history synchronization for each of the dictionary candidates, and wherein the dictionary generation unit generates the dictionary information based on the dictionary candidate of the dictionary target selected by the dictionary candidate selection unit.