9. A data search method comprising: inputting an input question; executing a first search processing on a basis of the input question; extracting an initial answer candidate on a basis of a result of the first search processing; inspecting the extracted initial answer candidate; and outputting the extracted initial answer candidate selected by the inspecting of the initial answer candidate as an answer of the input question, wherein: the inspecting of the initial answer candidate comprises: generating one or more queries and executing a second search processing using the queries, each of the generated queries being a character string pattern relative to the input question and being generated based on one or more keywords including in the input question and one of the extracted initial answer candidates; determining whether or not a composed word of a sentence, which is obtained as a result of the second search processing executed by using the query including the initial answer candidate, has a similar lexical meaning to a lexical meaning of a specific word of the input question; and selecting the initial answer candidate included in the query, which is used when searching the sentence including the composed word that has the similar lexical meaning, as the answer.
11. The data search method according to claim 9 , further comprising: extracting a question focus from the input question, wherein: the inspecting of the initial answer candidate comprises: generating the query including the extracted question focus and the extracted initial answer candidate.