HISTORY INFORMATION ANONYMIZATION METHOD AND HISTORY INFORMATION ANONYMIZATION APPARATUS

摘要

PROBLEM TO BE SOLVED: To prevent information loss due to anonymization.SOLUTION: A history information anonymization method includes: an association step S101 of associating each of multiple pieces of history information collected from a plurality of TVs in the current period, with a temporary ID associated with a TV having collected the information; a grouping step S102 of grouping a plurality of temporary IDs having the same content of history information associated in the current and past periods; an anonymity determination step S103 of determining whether each of the groups satisfies anonymity or not; and an ID changing step S104 of changing only a part of the temporary IDs associated with a plurality of TVs when a determination is made that one of the groups does not satisfy anonymity.SELECTED DRAWING: Figure 9