The setting of a search condition is supported. Databases 130 and 140 store use frequency information about search conditions, co-occurrence frequency information between search conditions, relationship information unique to a particular field, use history information for each search condition, and simultaneous use history information. Based on a search condition that is already set, the database are referred to so as to calculate the recommendation level of other search conditions, and search conditions that have high recommendation levels and that are likely to be used simultaneously with the already-set search condition are arranged at conspicuous positions. The recommendation level is calculated based on the value of a co-occurrence frequency between search conditions, the history of simultaneous setting, or the estimated number of search results, for example.