The way is connecting Internet through wireless device by command.I attempt to find out any solution of GUI, but no available.If you don't like use command,please forget about this post.

=====Setup Procedure=====

1. Please see the below diagram for make sure your Network Setup Method using traditional method with ifup.





Then choose ifup method

2. Please make sure you are able to connect to the access point.

Below is an example:
==Access Point==
ip address: 192.168.1.1
ssid: AP11
channel: 1

==Client==
assigned ip address: 192.168.1.111

#iwconfig

wlan0 IEEE 802.11g ESSID:""
Mode:Managed Frequency:2.437 GHz Access Point: 00:13:49:AE:FA:B8
Tx-Power=27 dBm
Retry min limit:7 RTS thrff Fragment thr=2352 B
Encryption keyff
Link Quality:0 Signal level:0 Noise level:0
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0

#iwlist wlan0 scanning|grep AP11
#iwconfig wlan0 essid "AP11"