아파치 디렉토리권한?

[root@ns server]# ls -al
ÇÕ°è 28
drwxr-xr-x  6 root root  4096  1¿ù 29 16:09 .
drwxr-xr-x 12 root root  4096  1¿ù 28 02:24 ..
drwxr-xr-x  3 root root  4096  1¿ù 29 14:02 APM
drwxr-xr-x 15 root root  4096  1¿ù 28 12:34 apache
drwxr-xr-x 12 root mysql 4096  1¿ù 28 03:22 mysql
drwxr-xr-x  7 root root  4096  1¿ù 28 12:54 php
[root@ns server]# pwd
/usr/local/server

[root@ns htdocs]# ls -al
ÇÕ°è 3200
drwxr-xr-x  4 root  root     4096  1¿ù 29 03:03 .
drwxr-xr-x 15 root  root     4096  1¿ù 28 12:34 ..
-rw-r--r--  1 root  root     2326 11¿ù 21  2004 apache_pb.gif
-rw-r--r--  1 root  root     1385 11¿ù 21  2004 apache_pb.png
-rw-r--r--  1 root  root     2410 12¿ù 15  2005 apache_pb22.gif
-rw-r--r--  1 root  root     1502 12¿ù 15  2005 apache_pb22.png
-rw-r--r--  1 root  root     2205 12¿ù 15  2005 apache_pb22_ani.gif
-rw-r--r--  1 root  root       73  1¿ù 29 03:00 index.html  <========덮어쓰기가 않되요?
-rwxrwxrwx  1 root  root       20  1¿ù 25 02:09 info.php
drwxr-xr-x  7 52400 24067    4096  1¿ù 29 01:25 phpmyadmin
drwx---rwx 10  1000  1000    4096  1¿ù 29 01:07 zbxe
-rw-r--r--  1 root  root  3227118  1¿ù 29 00:46 zbxe.beta.0.2.8.tgz
[root@ns htdocs]# pwd
/usr/local/server/apache/htdocs

[root@pas apache]# ls -al
ÇÕ°è 60
drwxr-xr-x 15 root root 4096  1¿ù 28 12:34 .
drwxr-xr-x  6 root root 4096  1¿ù 29 16:09 ..
drwxr-xr-x  2 root root 4096  1¿ù 28 12:34 bin
drwxr-xr-x  2 root root 4096  1¿ù 28 12:34 build
drwxr-xr-x  2 root root 4096  1¿ù 28 12:34 cgi-bin
drwxr-xr-x  4 root root 4096  1¿ù 29 16:11 conf
drwxr-xr-x  3 root root 4096  1¿ù 28 12:34 error
drwxr-xr-x  4 root root 4096  1¿ù 29 03:03 htdocs
drwxr-xr-x  3 root root 4096  1¿ù 28 12:34 icons
drwxr-xr-x  2 root root 4096  1¿ù 28 12:34 include
drwxr-xr-x  3 root root 4096  1¿ù 28 12:34 lib
drwxr-xr-x  2 root root 4096  1¿ù 29 16:20 logs
drwxr-xr-x  4 root root 4096  1¿ù 28 12:34 man
drwxr-xr-x 14 root root 4096  4¿ù 22  2006 manual
drwxr-xr-x  2 root root 4096  1¿ù 28 12:54 modules
[root@ns apache]# pwd
/usr/local/server/apache

[root@ns server]# ls -al
ÇÕ°è 28
drwxr-xr-x  6 root root  4096  1¿ù 29 16:09 .
drwxr-xr-x 12 root root  4096  1¿ù 28 02:24 ..
drwxr-xr-x  3 root root  4096  1¿ù 29 14:02 APM
drwxr-xr-x 15 root root  4096  1¿ù 28 12:34 apache
drwxr-xr-x 12 root mysql 4096  1¿ù 28 03:22 mysql
drwxr-xr-x  7 root root  4096  1¿ù 28 12:54 php
[root@ns server]# pwd
/usr/local/server

[root@ns local]# ls -al
ÇÕ°è 92
drwxr-xr-x 12 root root 4096  1¿ù 28 02:24 .
drwxr-xr-x 14 root root 4096  1¿ù 27 22:49 ..
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 bin
drwxr-xr-x  3 root root 4096  1¿ù 29 16:02 etc
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 games
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 include
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 lib
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 libexec
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 sbin
drwxr-xr-x  6 root root 4096  1¿ù 29 16:09 server
drwxr-xr-x  4 root root 4096  1¿ù 27 22:45 share
drwxr-xr-x  2 root root 4096  3¿ù 30  2007 src
[root@ns local]# pwd
/usr/local

index.html은 덮어 쓰기가 않되는데 왜 구런건지요? index.html 권한은 755로 해도 마찬 가지네요

현재  Centos5.1 / PHP Version 5.2.5 / MYSQL 5.0.21  가 설치 되어있습니다