To provide a construction object mediating system capable of a factor, of a difference in estimated prices between a large-sized construction company and a small or medium-sized construction company in both the aspects of labor costs related to an integration job and facility costs.

This construction object mediating system is provided with an authentication means 2 for calling the input of identification information through communication equipment 1 of a member connected to a telecommunication line and authenticating the inputted identification information and an integration information providing means 3 for showing the integration information of construction object derived from the materials of the relevant construction object ordered from single or plural clients through the communication equipment 1 of the member like a list, calling the display of an intention desiring acquisition, and loading the integration information, which receives the display of the relevant intention, to the communication equipment 1 of the relevant member.