I want to do a project in my local host. How can I install Magento on my PHP Apache local server?
If you're on Windows, a simple solution would be to use XAMPP, which is basically a pre-packaged installation of Apache, PHP, MySQL plus additional useful tools. You might give it a try :)
If you're using Linux, a Google search for "LAMP tutorial" should yield some results useful to you..
Happy hacking! :)
Edit: Okay, maybe because it's early in the morning here, I seem to have misunderstood your question. Maybe you can find some further information regarding the Magento installation in the Installation guide. If you could describe your trouble a little more detailed, we could help too.