1. An apparatus for displaying a result of analogous image retrieval, comprising: a person characteristic database that stores person characteristic data extracted from a plurality of cameras; a retrieval request receiving section that receives as a retrieval key an identifier for identifying a person to be retrieved; a characteristic retrieval section that retrieves a person matching the retrieval key received by the retrieval request receiving section from the person characteristic database in descending order of similarity; a retrieval result grouping section that reclassifies a list including a result of retrieval performed by the characteristic retrieval section into units, each of the units is estimated to belong to same environment; and a retrieval result display section that displays a grouped result performed by the retrieval result grouping section.