To provide a method for reducing the occurrence of a money trouble between a client and a contractor by making even a person, unfamiliar with a building, understand a designer/contractor's job and check operation processes, in operations for building a wooden building.

The person confirms construction work from a geological survey to exterior construction work by understanding the designer/contractor's job by means of a video, a CD, a DVD, an image, a text with an illustration, and simple instruments, and checking various kinds of construction and operation processes. Concurrently with that, the person calculates a reasonable construction contract price by using a standard construction price scale, after understanding various kinds of construction methods, and checks a construction price.