An IT resource management system for managing a plurality of IT resources owned by a plurality of operating entities includes a supply condition accumulating part for accumulating a supply condition of a surplus IT resource, a demand condition accumulating part for accumulating a demand condition of an insufficient IT resource, a matching part for extracting a set of a supply condition and a demand condition matched with each other from the supply conditions and the demand conditions accumulated in the accumulating parts, and an assigning part for allowing an IT resource under the supply condition of the set to be available for an operating entity under the demand condition of the set.