The system 10b, the tablet functions as the manager 200 and the UI device 400. As in the foregoing first example, the tablet may be replaced with another device such as a smartphone. In the illustrated example, the elements 100 include an acceleration sensor 100a, a camera 100b, a human detection sensor 100c, a button 100d, a speaker 100e, a light-emitting diode (LED) lamp 100f, and a microphone 100g. Each of the elements 100 communicates with the tablet through wireless communication such as Bluetooth (registered trademark) and performs a linkage operation under the control of the manager 200 realized by the tablet.
In the following examples, some or all of the acceleration sensor 100a to the microphone 100g are illustrated as examples of the elements 100, but kinds of the elements 100 are not intended to be limited to those used in any of the examples. In each of the examples, the system 10 can include any of the acceleration sensor 100a to the microphone 100g or any other kinds of elements 100.