An apparatus for evaluating organization efficiency, a method for evaluation service of organization efficiency, an apparatus for generating communication frequencies, a method for generating communication frequencies, and programs and recording media of the same, quantitatively evaluate efficiency of an organization structure. The present invention provides an apparatus for evaluating organization efficiency having communication frequencies among departments obtaining unit for obtaining communication frequencies among departments, the frequency being frequencies of information interchanges among departments within an organization; a group definition data obtaining unit for obtaining group definition data, the data defining a group including more than one department within an organization; communication frequencies among groups calculation unit for calculating communication frequencies among groups for groups interchanging information, on the basis of communication frequencies among departments; and an organization efficiency calculation unit for calculating efficiency of an organization structure defined by group definition data, on the basis of the communication frequencies among groups.