Shopper currency assigned by country

[Siguana]

  I am making an iternational e-commerce website with several currencies, so I want that customers watch the prices of the items with the prices of their countries.  For example:

- People from European Union should watch the website with prices in euros.
- People from USA should watch the website with prices in dollars.
- People from China should watch the website with prices in yuans.
- Etc.

  The problem is that I input the original prices in Japanese yens, but I need customers to watch the prices of the items with the prices of their countries.  Is there any plugin for this?