2. The data analysis method of claim 1 , wherein the step of creating a semantic entity repository comprises the step of modifying an existing semantic entity repository, wherein at least one of said entity set, said reference ranges, and said mapping in said existing semantic entity repository is an empty set into which new elements may be added, and wherein the step of modifying an existing semantic entity repository comprises the steps of: adding, deleting, or modifying the entities and properties thereof in said entity set; describing or modifying the reference ranges of possible values of properties; and creating, deleting, or modifying mappings between the entities and properties thereof and the data structure.
3. The data analysis method of claim 2 , said method further comprising the step of establishing mappings between said reference range and a real value range of the data in the data warehouse if they are inconsistent with each other.