Coppermine can read IPTC and EXIF data, but you won't be able to get keywords into your albums that way. You can add keywords manually by choosing to EDIT the pictures in the album, then you will see the keywords box under the description box. Just type them in there. When editing a page of images in your album, don't forget to SAVE before you go to the next page of images, or you will lose your edits.
There is a plug-in that allows you to add multiple keywords and other such stuff. I haven't used that myself, but you can read about it download it here