To solve several types of project management problems, efficient project management is being demanded. Success or failure of the project hangs to the skill of project manager. However in general, it is not easy to make an excellent manager trained quickly. The excellent project manager must be needed to have a lot of knowledge about the project management, and the good knowledge is needed to grow them up. If the knowledge is considered to be a kind of judgment for the effective action, first of all the registration of manager's action and experience is needed. Group of low-level information and data is called knowledge in this paper. It is necessary to register the knowledge easily. But it is difficult to find the timing to register the knowledge. This paper shows how to find the best timing of registering the knowledge, and registration for the knowledge. As the result, it has been understood that there is a possibility that the knowledge can be registered automatically. It will be necessary to achieve the function to register the knowledge at the just timing in the future.