A group management apparatus manages, as a plurality of groups, numerous installation devices installed in a plurality of buildings. The group management apparatus includes an acquiring component, a summarizing component and a screen generating component. The Acquiring component acquires operating data of the numerous installation devices via controllers. The controllers are placed in the buildings and control the numerous installation devices inside the buildings. The summarizing component summarizes, per group, operating data values that are values represented by the operating data. The screen generating component generates a screen in which results, with respect to the plurality of groups, of the operating data values having been summarized by the summarizing component are juxtaposed.