The control module 210 is a CPU (Central Processing Unit), a microprocessor, a DSP, or the like, for example, and comprehensively controls the operation of the devices 20 to realize various functions (modes). Specifically, the control module 210 executes instructions included in the programs stored in the storage 212 referring to data stored in the storage 212 or data developed in the memory 211 as necessary, and then controls the monitor 203, the wireless communication module 215, the communication module 216, the audio device 217, and the like to thereby realize various functions (modes). The programs to be executed by the control module 210 and the data to which the control module 210 refers may be downloaded or uploaded from the server apparatus 10 by communication by the communication module 216 or the wireless communication module 215.