| 摘要 |
A plurality of records are stored in a record storage unit (501). During a first period of time, an update unit (502) stores, in first score fields, first scores calculated by a first algorithm, and also stores, in second score fields, second scores calculated by a second algorithm. During a second period of time, the update unit (502) stores first scores in both the first score fields and the second score fields. A search unit (503) searches for records, and sorts the found records on the basis of the scores stored in the first score fields if the searching user belongs to a first group, or sorts the found records on the basis of the scores stored in the second score fields if the user belongs to a second group. A collection unit (504) collects responses from first users belonging to the first group, and also collects responses from second users belonging to the second group, with the responses from the second users being associated with the proportion of the records, among the found records, the first and second score fields of which have the same score stored therein. An estimation unit (505) estimates a response rate exhibited by the first users and a response rate exhibited by the second users. |
