To enable the high-density utilization and high-speed utilization of a radio system without a radio interference among room groups in a building.

In the room-group radio environment control method in the building, by which the radio system can be used without a radio interference among the room groups in the building, electromagnetic shield is executed onto specific wall surfaces, floor faces or ceiling surfaces among the room groups, in which the radio interference must be reduced, and electromagnetic shield partitions 1, 11 are constituted, a site in which radio waves are shielded and a site in which they are not shielded are combined excellently and environment in which the radio system can be utilized even in a passage, an anteroom or the like, reducing a mutual interference at every room is provided. Accordingly, the high-density utilization and high-speed utilization of the radio system such as a radio LAN are enabled without the radio interference in the building composed of a plurality of rooms such as a university, an office, a hospital, a hotel or the like, the radio system can be connected to a wire network in the building at any time at anywhere, and provided various service can be used.