Metadata Services in Sharepoint 2010

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SharePoint2010

HI,

I have a custom list as Country in sharepoint in this some of them is Metadata field like
Country Name

the main task is that when user click on Add new Item in one field which is metadata field user choose country name now i want that in the next field region name should come automatically, means it should be pre populated based on above metadata field.


like i am having to column Named as Country and Region
in this, Country is metadata field and region could be a calculated field or text field depend on Country field. As i choose Country name in Country (Metadata) field the region of this country should automatically populate in to region field...

like if i choose

Country India then in Region field
Region Asia should automatically come in that

Any Answer for this query..