Is there anyway that i can install every latest application without upgrade my distribution?
Well ... yes you can. You could install 12.10. Technically that is not a dist-upgrade ;) Backup your private files, format the disc and install 12.10 as a brand new installation.
If not, then why i can't do that?
Because the repositories for a release do not have the software that is not for newer releases (backports excluded). To get the software for 12.10 you need to change the resources list and have it point to the 12.10 repositories. What in effect is a distribution upgrade.
If you want a setup where you can do this you need to find a linux flavour that supports a roling release. Examples: Debian unstable, Sabayon Linux, Calculate Linux, Funtoo Linux (all based on Gentoo Linux), Arch Hurd, ArchBang, CTKArch, KahelOS, and Parabola GNU/Linux (all based on Arch Linux), Arch Linux, Gentoo Linux, rPath Linux, and Yoper Linux.
1 additional comment:
As of 13.04 this is going to change: archive.ubuntu.com will get a symlink always pointing to the current development release. So basically, users will be able to always use the current Ubuntu development release without having to upgrade.