The question does not make sense to me.
There's no distinction such as
SEO keywords and people keywords. Keywords are JUST keywords, words used BY PEOPLE (and not by search engines) and searching what they want. There are tools such as Google Keyword Tool (search it in Google, I'm in lazy mood to make it a hyperlink) that you can use to know what keywords people frequently use. Targetting these keywords should be part of your
SEO effort.