A system to secure people's safety in places such as a factory wherein people and industrial robot collaborate with each other in a state that a physical fence surrounding the preferred industrial robot's working region is excluded. The system is capable of acquiring respective distances between robot and a plurality of people. Furthermore, a critical distance of each person is set on the basis of at least one of personal information that each person individually has and environment information to be set depending on the robot's setting environment. A mounted-type monitor is respectively mounted on the plurality of people and is capable of displaying information within a view of each person, and a control unit is capable of controlling display content thereon. According to the display control, when a distance between robot and each person becomes less than a critical distance, the distance state is displayed on the mounted-type monitor.
