Abstract: An apparatus includes a memory for storing database data and a processor. The processor is configured to: analyze historical clustering data, and which is decomposed into clustering atoms based on the properties of each part of the historical clustering data, and associating the clustering atoms with at least one of clustering attributes of the historical clustering data to which the clustering atoms belong; and form a clustering atomic pool according to the properties of the clustering atoms, and the clustering atomic pool includes an unstructured relationship of the clustering atoms; search the clustering atoms from the clustering atom pool to form alternative clustering atoms, wherein the search is based on a target clustering attribute of target clustering data, the clustering attribute associated with the clustering atom and the properties of the clustering atom; and form the target clustering data by referencing the alternative clustering atoms.