14. The method according to claim 10 , wherein the acquiring step acquires the history information on the viewing of the word and the history information on the usage of the word, and if the history information on the viewing of the word does not meet a criterion that is related to the viewing of the word and predetermined as a criterion for presuming that the particular user knows the meaning of the word and if the history information on the usage of the word does not meet a criterion that is related to the usage of the word and predetermined as a criterion for presuming that the particular user knows the meaning of the word, the determining step determines that the meaning of the word needs to be presented to the particular user.
10. A method for helping in a reading of an electronic message exchanged between multiple users, the method comprising the steps of: a chat room or instant message utility sending an electronic message between users; extracting a word from the electronic message sent to a particular user; acquiring history information on viewing and usage of the extracted word by the particular user; and determining whether a meaning of the extracted word needs to be presented to the particular user, according to the acquired history information, wherein the determining is based on a criteria related to the viewing of the word by the particular user.