Fecha de publicación: 15/12/2022 Fuente: WIPO (eseential oils OR extracts) An extraction unit (15b) extracts a fixed-length feature value from a communication data payload. A calculation unit (15e) calculates the degree of similarity between the feature values of abnormal communication data. When the calculated degree of similarity is greater than a predetermined threshold, a determination unit (15f) determines that 《RA2》these communications《/RA2》 are the same type of events.