The 6 processes you see are 6 available connections for web browsers to connect to. The main application is only running once in memory but has 6 children listening on port 80 for a connection.
If you look at the process tree you will see something like this:
root 27321 0.0 0.4 273852 18160 ? Ss Jul20 0:00 /usr/sbin/httpd
apache 15209 0.0 1.0 299912 38492 ? S Jul26 0:09 \_ /usr/sbin/httpd
apache 15214 0.0 1.0 299988 38456 ? S Jul26 0:05 \_ /usr/sbin/httpd
apache 15215 0.0 1.0 300016 38496 ? S Jul26 0:07 \_ /usr/sbin/httpd
apache 15217 0.0 1.0 302396 40896 ? S Jul26 0:08 \_ /usr/sbin/httpd
apache 15228 0.0 1.0 299980 38528 ? S Jul26 0:06 \_ /usr/sbin/httpd
apache 15229 0.0 1.0 300072 38456 ? S Jul26 0:07 \_ /usr/sbin/httpd
apache 15230 0.0 1.0 299900 38588 ? S Jul26 0:06 \_ /usr/sbin/httpd