How do you remove background noise from video recorded by Canon sx210 IS ?

[Kratos]

I'm using a Canon sx210 IS power shot to record my videos. Although the sound recorded in the video is stereo I'm getting a lot of background noise.
How can I remove this noise at the recording process when I'm using the camera? If I can't do that...then what software can?

Thanks

Try to ask other owners of the camera.

I only tried to remove noise from recordings made with my Mp3 player. I used freeware Audacity for that.

You can do something similar. Just extract an audio track, remove noise and then replace your old audio track with a cleaned one.