1. A computer-implemented method for providing vocabulary information, comprising: for each of a plurality of words of a text, determining, by at least one computer processor, a relevance of the word to the text; and for each of at least a subset of the plurality of words, outputting, by the at least one computer processor, an indication of the respective determined relevance of the word to the text; wherein, for each of the plurality of words, the determining includes comparing, in a first comparing step, a frequency of the word in the text to a frequency threshold.