An operation analysis apparatus comprising: an acquisition unit configured to acquire a plurality of pieces of operation information indicating operations of a plurality of persons to be analyzed, wherein the operations are any of picking components, arranging components, fixing components, packing products, screw fastening, and inspection; a classification unit configured to classify the plurality of pieces of operation information into a plurality of groups, each group of the plurality corresponding to a respective group of the plurality of persons to be analyzed, wherein different groups of the plurality of persons are defined based on a difference in at least one physical feature between persons of the plurality of persons to be analyzed; and an analysis unit configured to analyze the operations of the persons to be analyzed based on the pieces of operation information that have been classified into the plurality of groups, wherein the plurality of pieces of operation information each include skeleton information that indicates positions of a plurality of body parts that are associated with the skeleton of each of the plurality of persons to be analyzed, wherein the classification unit classifies the plurality of pieces of operation information into a plurality of groups, namely a group of large persons and a group of small persons to be analyzed, that respectively represent body builds of persons to be analyzed, using the skeleton information included in the operation information, and wherein the analysis unit is configured to change the analysis method or the reference used for the analysis for each of the groups that have been classified by the classification unit. an acquisition unit configured to acquire a plurality of pieces of operation information indicating operations of a plurality of persons to be analyzed, wherein the operations are any of picking components, arranging components, fixing components, packing products, screw fastening, and inspection; a classification unit configured to classify the plurality of pieces of operation information into a plurality of groups, each group of the plurality corresponding to a respective group of the plurality of persons to be analyzed, wherein different groups of the plurality of persons are defined based on a difference in at least one physical feature between persons of the plurality of persons to be analyzed; and an analysis unit configured to analyze the operations of the persons to be analyzed based on the pieces of operation information that have been classified into the plurality of groups, wherein the plurality of pieces of operation information each include skeleton information that indicates positions of a plurality of body parts that are associated with the skeleton of each of the plurality of persons to be analyzed, wherein the classification unit classifies the plurality of pieces of operation information into a plurality of groups, namely a group of large persons and a group of small persons to be analyzed, that respectively represent body builds of persons to be analyzed, using the skeleton information included in the operation information, and wherein the analysis unit is configured to change the analysis method or the reference used for the analysis for each of the groups that have been classified by the classification unit.