ANONYMIZATION SYSTEM, ANONYMIZATION METHOD, AND ANONYMIZATION PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide a technique for anonymizing data of an anonymization target period on the basis of a value after subjecting the data to abstraction.SOLUTION: An anonymization system, an anonymization method, and an anonymization program executes the steps of: acquiring a target period during which anonymization is carried out; acquiring target data corresponding to the target period out of target data containing multiple items associated with an individual; generating abstracted candidate data by replacing a word being a value of an item in the target data with an abstracted word; receiving a value of the words contained in the abstracted candidate data and obtaining a value of the abstracted candidate data on the basis of the value of the words contained in the abstracted candidate data; performing verification under a condition that a combination of values of the items of the abstracted candidate data is not restricted to one individual of the target data; selecting abstracted candidate data on the basis of the value of the abstracted candidate data satisfying the verification condition; and outputting the abstracted candidate data selected on the basis of the value, as anonymous information.