| 摘要 |
PROBLEM TO BE SOLVED: To specify a period in which the use of a certain keyword is prevalent in a period which cyclically appears.SOLUTION: An information processor determines the threshold of the number of use on the basis of the number of use of a keyword in each unit period included in a cyclic period. The information processor specifies a period in which the number of use exceeds the threshold in the cyclic period as the candidate of the prevalent period of the keyword. Then, when configurations that the number of use in the specified period exceeds the threshold are different from configurations based on the cyclic prevalent of the keyword, the information processor excludes the specified period from the prevalent period. Then, when the specified candidate period is not excluded from the prevalent period, the information processor determines the specified period as a prevalent period. |
