What are you talking about when you say area --- are you talking about geographic targeting or category targeting?
Geographic is fairly straight forward, Category is much more copmplex.
Geographic: What you need to do is get the end users IP address.. So I connect to your server - you server has my IP - which if you do a DNS lookup will tell you where I am located
From this information you can make sure American's receive America Adverts, French receive French etc...
The best source of information on this including the data you require to match an IP to a location is available from
Maxmind.
Category Targeting - that is showing Car adverts to people who are interested in cars is far more complex. However, what you require is a tracking cookie (check on google) which will teel you the sites and searches people do after they have visited your site.
There are a number of companies that supply services to manage such work for you... however, this type of targeting is not only frowned upon but in some locations regarded as illegal and an invasion of privacy unless the user specifically requested the tracking cookie to be installed.
If this has helped you the please vote
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