Moreover, appearance should be considered prudentially. Thus, it should be restricted to the range, which does not bring big influence on the existing environment. DIND is a small device based on three functions that the dynamic environment, which contains people and robots, is watched by the sensor, information is processed to be known easily by the clients by the processor and the DIND communicates with other DINDs through networks. We classified existing environments according to the affordance . This space includes some information, however, to acquire the information from the space, a client needs high intelligence.
Natural environment is a representative example.
In the figure, we can recognize that it is a road intuitively. However, it is ambiguous that to where this road is connected and a man who want to use the road should prepare map-like things to get additive information of the space. In this space, artificial signs are included in the natural space. A client needs less intelligence to acquire the information from the space. As an example, general living environment is considered.