> I think that www-data is the user that runs the apache webserver for security.
> But, one thread of apache is owned by root.
>
> What is the concept behind it?
> Why root owns one thread?
>

It is mostly likely running in prefork model. In the following link, 
look at section "How it works".

http://httpd.apache.org/docs/2.0/mod/prefork.html

The short answer to your question is to bind to privileged port 80.

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