The infrastructure management of Japan has problems in both sides of supply and demand. In the demand side, the problems exist in the overseas relocation of industrial activities and also the decrease in population. In the supply side, on the other hand, the problem is the high renewal costs of the aging infrastructure. It is actualizing especially in the local area. The infrastructure management is required in a timely manner. The time management is an important viewpoint in that case. It is required to practice optimization of an infrastructure level in accordance with the demand, and it is important to disclose related the infrastructure information for that purpose.
