A communication system according to the present invention includes: a
mobile station 10; an access point located on a radio access system; and
a switch apparatus 30 connected to the radio access system, wherein a
secured connection between a mobile station 10 and the access point 20
has been already established. The mobile station 10 includes a judgment
unit 30 configured to judge whether or not to establish a secured
connection between the mobile station 10 and the switch apparatus 30.