the processing in s 32 in other words in this case the category specification unit 116 refers to for example u201c 0 2 u201d which is information where u201c a 1 u201d is set in the top row u201c 0 5 u201d which is information where u201c a 2 u201d is set in the top row in the column and u201c 0 4 u201d which is information where u201c a 3 u201d is set in the top row in the column description on the other information included in fig2 will be omitted an example of the first correlation information of one first incident 141 b out of the first incidents 141 b extracted in the processing in s 25 will be described next fig2 is a table for describing an example of the first correlation information as items the first correlation information in fig2 has u201c item number u201d to identify each information included in the first correlation information u201c category u201d to identify each category and u201c score u201d to indicate the first correlation information of each keyword each information included in the first correlation information in fig2 will be described based on the assumption that the values are set in u201c score u201d in descending order in concrete terms if u201c define u201d and u201c memory u201d are included in the keywords extracted from the first handling method 141 c the category specification unit 116 refers to.