A search using a plurality of search queries and a check of a result of the search are performed efficiently. A plurality of search queries are received. A plurality of documents are searched on the basis of each of the plurality of search queries. A plurality of search results are obtained for each of the plurality of documents. The document search results are output by outputting the plurality of search results for each of the plurality of documents as a first table. One of a group of items on the vertical axis and a group of items on the horizontal axis in the first table represents the documents, and the other represents the search queries. The search result can be shown with two values indicating whether or not a document satisfies a search query, with the number of blocks satisfying a search query in a document, or the like.