Communication system, communication terminal, and communication program

If a connecting link to a wireless LAN displayed on a connection guide screen which is acquired from a web server 20 for connecting to a wireless LAN is selected and confirmed by a user, a cellular phone 10 registers the connection setting of the wireless LAN, based on the connection setting information of the wireless LAN which is set to the connecting link. If it is determined, based on beacon information output from an access point 30, that the cellular phone 10 exists within a communicate-able area AR of the wireless LAN, the cellular phone 10 switches the connection destination of the cellular phone 10 from the web server 20 to the access point 30.