Image search conditions that are past search conditions are displayed in an image search history area, and text search conditions are displayed in a text search history area. When a user selects a desired image search condition out of the search conditions displayed in the image search history area, and selects a desired text search condition out of the search conditions displayed in the text search history area, case data that matches the selected image search condition and the text search condition is extracted from a database and displayed in a search result display area.