7. A data classification device according to claim 1, wherein, when a plurality of types of components are designated as the classification data, the classifying means generates hierarchical classification structure data indicative of a hierarchical classification structure in which data units are classified into one or more upper level classes based on an upper level type of components and in which data units within each of the upper level classes are classified into one or more lower level classes based on a lower level type of components.
1. A data classification device comprising: first designating means for designating a data group to be classified among a plurality of data groups, each of the data groups including one or more data units., each of the data units including a plurality of components; second designating means for designating one or more types of components as classification data; and classifying means for classifying data units within the data group designated by the first designating means into one or more classes based on the classification data designated by the second designating means.