To handily buy tile wall flaw insurance at a proper content.

An insurance contract page is provided on the Internet home page of a tile maker or the like. Data such as a substrate structure, the name of a tile worker, a tiling method, the kind of tile, and a tiling area are selected or inputted on the page, and an insurance fee is calculated based on the data. When a client understands insurance contents, he applies for insurance. He can take change procedures via the Internet when he desires a change of insurance contents.