10. An automatic keyword extraction method according to claim 6 , further comprising downloading the second keyword dictionary via a network, wherein the downloaded second keyword dictionary is used in the step of extracting the keyword utilizing the character type separation method.
6. An automatic keyword extraction method, comprising: extracting, using a processor, a keyword from title character string information which designates a title of contents in electronic program guide (EPG) information using a first keyword dictionary in which a character string designating a sub-genre is registered; and extracting a keyword from detailed character string information which explains details of the contents in the EPG information using a second keyword dictionary in which names of persons are registered, and extracting a keyword utilizing a character type separation method, said extracting a keyword from title character string information includes making a whole title character string or strings in which character strings registered in the keyword dictionary for titles are included within a respective program title or titles a keyword extraction objective or objectives, substituting by a space or spaces a portion or portions of a character string or strings which are designated in an exclude character string dictionary for titles within a title or titles which are made to be a keyword extraction objective, and extracting a keyword therefrom in accordance with a predetermined rule, and said predetermined rule includes extracting an entire respective title string when the respective title string is not separated by a special character from among a number of predetermined special characters which does not include “•” (midpoint), extracting two or more letters of the respective title string when the respective title string is separated by the special character, and when the respective title string includes the “•” (midpoint) at a beginning or end thereof extracting the respective title string without the “•” (midpoint).