1. Field of the Invention
The present invention relates to a communication system.
2. Description of the Related Art
A technique has been known such that, for connecting a device to an ad-hoc network that is formed of a radio network, such as a wireless local area network (LAN), authentication is automatically executed so as to obtain connection permission by using short-range radio communication with a communication area that is smaller than that of the ad-hoc network.
As a technique for establishing communications among devices, a technique has been know such that a device that has already participated in a radio network provides permission via proximity communication (cf. Patent Document 1 (Japanese Unexamined Patent Publication No. 2013-242925), for example).