A usability evaluation apparatus evaluates usability of evaluation objects by evaluation items (201 and 202) that have a hierarchical structure that is divided into a plurality of hierarchies and supplies usability evaluation points (206) that are the evaluation results to an output element. The output element is caused to supply as output a tree map in which are represented rectangular regions that have shapes that accord with degrees of importance (203 and 204) that indicate the relative importance of evaluation items (201 and 202) in the hierarchy and that indicate the evaluation items (201 and 202) such that the hierarchical structure can be distinguished and graphs that indicate the absolute values of usability evaluation points (206) such that the graphs are depicted in rectangular regions (501) that indicate the lowest-level evaluation items on the tree map according to the shape of the rectangular regions (501).