| 摘要 |
PROBLEM TO BE SOLVED: To easily and appropriately track back to a desired search state.SOLUTION: At least one candidate keyword is extracted from character information included in a search result obtained by recognizing search conditions applied with a voice, and searching a database on the basis of the search conditions. The candidate keyword and a search state including the search result from which the candidate keyword has been extracted are stored in association in a storage part. The search state is controlled so as to be tracked back to the search state stored in association with the candidate keyword corresponding to a recognized backtracking keyword. This control is performed when new search conditions changed from the search conditions, and applied with a voice are recognized, and a backtracking instruction word and the backtracking keyword are both recognized after search based on the search conditions is performed. |
