Fecha de publicación: 05/01/2023 Fuente: WIPO (eseential oils OR extracts) Provided is an anonymization technique that maintains the usefulness required for analysis without compromising the value of movement history. This anonymization device assumes that movement history data is time-series data including location information and times and is obtained by vehicles, and comprises: a POI database storage unit that stores a polygon data set, which is a set of polygon data that indicates sites including parking lots of arbitrary facilities and that is associated with facility name data; a point extraction unit that extracts, from target movement history data, the movement history data inside polygons included in the polygon data set; a point facility combining unit that refers to the POI database storage unit and combines the extracted movement history data with the facility name data associated with the polygon data including that movement history data; a location information deletion unit that deletes location information from the movement history data that has been combined with the facility name data; and a duplicate facility deletion unit that deletes, from the location information-deleted movement history data, movement history data including the same facility name as other movement history data, and sets the resulting movement history data as anonymized movement history data.