4. The apparatus according to claim 1 , further comprising a third interface unit configured to provide a user with a user interface screen for causing the user to specify the concatenation condition, the third interface unit storing in the storage unit the tuning information including the concatenation condition specified by the user on the user interface screen.
4. The apparatus according to claim 1 , further comprising a third interface unit configured to provide a user with a user interface screen for causing the user to specify the concatenation condition, the third interface unit storing in the storage unit the tuning information including the concatenation condition specified by the user on the user interface screen. 5. The apparatus according to claim 4 , wherein the user interface screen includes an area which causes a user to specify which of the documents acquired by the document searches by the search engine and the abstracts of the acquired documents are used as search results for the plurality of second question sentences to be concatenated with each other by the concatenation unit.