Is it very important tag like H1, h2, or not? Please tell me how important of this keyword regarding SEO?

Placing good keyword-rich text in noframes tags is a good idea if your site is framed, but a much better idea is to remove frames altogether and rebuild the site properly. A framed web site is not search engine friendly as long as it uses noframes tags.
Don't stuff in too much keywords in the noframes tag, otherwise you can face a penalty from google.

These Tags are Very important but you have to keep in mind that the density of the page.

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