PROBLEM TO BE SOLVED: To automatically generate a generalization hierarchy which guarantees a granularity of a value of a quasi-identifier required by a secondary user.SOLUTION: A personal information anonymity apparatus comprises: a designation unit which accepts designation of a parameter used for generating a generalization hierarchy which guarantees a granularity of a value of a quasi-identifier required by a secondary user and defining a processing rule for giving the granularity to the quasi-identifier; a generation unit for generating a generalization hierarchy about personal information according to the designated parameter; a first storage unit which stores the personal information; a second storage unit which stores a data structure of the personal information; a third storage unit which stores the parameter; and a fourth storage unit which stores the generalization hierarchy generated by the generation unit.SELECTED DRAWING: Figure 7
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