The focal length of the lens given is a '35mm equivalent' (which is standard for digital cameras, as the area that light rays are focussed onto varies between makes and models).
55mm is roughly the 'standard' lens that you used to get in 'point and shoot' 35mm film cameras. 18mm is at the 'very wide angle' end of the scale. So, while you've got a lens which can cope extremely well with landscapes and group shots, it's lousy for portraiture (which requires a focal length of, say, 135mm) or telephoto shots (typically needing a focal length of at least 300mm).
As with all DSLR cameras, you shouldn't even consider buying it unless you're prepared to spend a lot more money on buying additional lenses. (A long telephoto lens for a DSLR can cost many times more than the camera itself).
Otherwise (assuming that you want something reasonably 'professional') you should be looking for a decent bridge camera, such as the Canon PowerShot range:
http://www.canon.co.uk/for_home/product_finder/cameras/digital_camera/bridge/#