Privacy protection device, privacy protection method, and life log management system

摘要

A privacy protection device includes an attribute update frequency management unit configured to calculate and record therein an update frequency of each attribute included in a life log of a user in response to storing of the life log; a static attribute extraction unit configured to calculate a threshold value of a change frequency on the basis of a static attribute, an attribute the update frequency of which is less than or equal to the calculated threshold value of the change frequency, the update frequency being recorded by the attribute update frequency management unit; and a notification request reception unit configured to extract the number of users satisfying the notification condition of the notification request, accept the registration of the notification request from the service provider when the extracted number of users exceeds the limit number of persons.