Autonomous driving technology is attracting social attention. However, there are still a lot of challenges for practical use in building. We have developed the automatic operation platform for building. The automatic operation platform communicates with mobile robots strolling in a building or a facility to accomplish their tasks. Especially, our platform treats multiple robots from different manufacturers. This paper shows the structure of the platform and an experiment in the actual building. In the experiment we demonstrate that our platform navigates visitors through a service robot.