20. An apparatus to generate information on a content, the apparatus comprising: a relationship determining unit to determine a relationship between first and second characters viewable to a user of a content according to relationship keyword information and according to additional hidden information that a user cannot see or recognize, to compare divided units of text of the content with relationship keyword information in which keywords contained in categories are defined, wherein the categories represent one or more relationships between the characters, the relationship determining unit including a determining portion to determine a relationship represented by a category corresponding to the highest number of the divided units as a dominant relationship between the characters; and an information generation unit to generate a signal representing a first image representing the first character, a second image representing the second character, and a third image representing the determined relationship.
20. An apparatus to generate information on a content, the apparatus comprising: a relationship determining unit to determine a relationship between first and second characters viewable to a user of a content according to relationship keyword information and according to additional hidden information that a user cannot see or recognize, to compare divided units of text of the content with relationship keyword information in which keywords contained in categories are defined, wherein the categories represent one or more relationships between the characters, the relationship determining unit including a determining portion to determine a relationship represented by a category corresponding to the highest number of the divided units as a dominant relationship between the characters; and an information generation unit to generate a signal representing a first image representing the first character, a second image representing the second character, and a third image representing the determined relationship. 24. The apparatus of claim 20 , wherein: the signal of the information generation unit comprises a user interface to be displayed on a screen; the first image and the second are spaced apart from each other within the user interface; and the third image is disposed between the first image and the second image within the user interface.