To provide a printing environment convenient to a mobile terminal operator which realizes not wasteful power consumption of a printers and/or the network when a mobile terminal having a wireless I/F such as information terminal equipment moves into a communication range of a network including a plurality of printers having a wireless I/F, readies printers nearer to the mobile terminal or in a stable communication condition ready to print and communicate that to the mobile terminal and displays.

The network system is composed of "information terminals and a plurality of printing devices "with a wireless unit. The wireless unit of the printing device has a reception level sensing means to gradually judge field strength received at least at a plurality of levels, and has a means to mutually exchange/analyze "reception level information" to be judged with other printing devices, and transits into a ready to print condition when it is more stable, nearer or coming nearer.