9. The information communication terminal according to claim 1 , wherein the keyword extraction module further comprises: a different meaning word meaning determination module, including: a different meaning word determination section configured to determine whether or not the plurality of words include a homonym or a homographe, by using knowledge network data in which vocabulary information showing a correspondence between a vocabulary and a reading sound of the vocabulary and link information showing a distance relation of the vocabulary; and a meaning determination section configured to determine the meaning of the word having a different meaning, based on the distance between the plurality of words.
9. The information communication terminal according to claim 1 , wherein the keyword extraction module further comprises: a different meaning word meaning determination module, including: a different meaning word determination section configured to determine whether or not the plurality of words include a homonym or a homographe, by using knowledge network data in which vocabulary information showing a correspondence between a vocabulary and a reading sound of the vocabulary and link information showing a distance relation of the vocabulary; and a meaning determination section configured to determine the meaning of the word having a different meaning, based on the distance between the plurality of words. 10. The information communication terminal according to claim 9 , wherein the different meaning word determination section further includes: a knowledge network data check section configured to refer to the vocabulary information and the link information; a different meaning word existence check section configured to refer to a result of checking the knowledge network data check section to determine whether a homonym or a homographe exists or not; and a vocabulary acquisition section configured to refer, when a homonym or a homographe exists, to the vocabulary information to acquire all vocabulary having an identical notation or reading sound with that of the word determined as a homonym or a homographe.