If I understand your question correctly. You want to find out under which users are running processes for apache/httpd when you are logged in on the server using Putty (using SSH)?
Well you can list all running processes and grep either apache/httpd like this:
ps -ef | grep -e apache -e httpd
I am not sure which distribution you are running, but apache is mostly running by user www-data. Here is example from my server:
root@root:~# ps -ef | grep -e php -e apache -e www | grep -v grep
www-data 9388 26594 0 22:20 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 14836 26594 0 22:27 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 16862 26594 0 21:27 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 18887 26594 0 21:57 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 20466 26594 0 21:30 ? 00:00:00 /usr/sbin/apache2 -k start
www-data 22832 26594 0 21:34 ? 00:00:00 /usr/sbin/apache2 -k start
root 26594 1 0 Sep14 ? 00:00:08 /usr/sbin/apache2 -k start
www-data 30217 26594 0 21:42 ? 00:00:00 /usr/sbin/apache2 -k start
Correct me if this is not what you were asking.