To give a more precise answer, I need more details about what kind of web server it is, and how you want the values to be shown there.
Ex. I got a web server on my QNAP nas, I am sending temperature readings and humidity to it by using a C# application, which receives the values from the arduino via the usb connection, then sends those values to my MySQL database, where the php then again fetches it.
How are you planning on doing it?