16. The computer system of claim 15 , when the first group of steps are used, the first score for the first term is determined based on a comparison between the first frequency of the first term in the text content and a frequency of the first term in contents external to the text content.
15. The computer system of claim 12 , when the first group of steps are used, the first score for the first term is determined further based on a first frequency of the first term in the text content.