| 摘要 |
PROBLEM TO BE SOLVED: To suppress information loss.SOLUTION: A method includes the processes of: selecting first data representing a group from a plurality of data including a first data item value, a second data item value which can be generalized to anonymize the first data item value, and the number of data which should be grouped to generalize the second data item value; extracting second data such that the number, calculated based upon the second data item value, of data which have distances less than a threshold from the first data and should be grouped is equal to or larger than a threshold; grouping at least some of the second data and the first data when the number of the first data and second data is equal to or larger than the number of data, included in the first data, to be grouped; executing the process for the selection, the process for the extraction, and the process for the grouping in the order of data larger in the number of data to be grouped; and generalizing the second data item value of the data included in the group, group by group, according to a predetermined rule. |
