1. A medical information system comprising a plurality of databases in which a plurality of kinds of medical data are respectively accumulated, said medical information system comprising: an input section for inputting a query that includes a plurality of search items; a sorting section for sorting said plurality of search items into a plurality of search divisions corresponding to said plurality of databases, respectively, in accordance with a predetermined sorting rule; a search section for independently searching said plurality of databases by using the search item included in the corresponding search division; and a generation section for combining individual search results extracted respectively from said plurality of databases by said search section, to thereby generate a combined search result.