Thanks for the information.
It is already worked, and I am able to connect to the internet and update my board. So, I am just setting fix IP address both on my board and PC (using same sub network of my switch).
Then, I need to run the following command, which I am not really sure why.
echo "nameserver 8.8.8.8" | sudo tee /etc/resolv.conf > /dev/null
Each time, I logout out from board, I need to run that command to connect to to internet.
But, at least my problem solved. Many thanks