1. A method performed by a processor, the method comprising: detecting a subject and a numerical representation in an original content, the numerical representation including a number with an associated unit of measurement; associating the detected numerical representation with the subject based on a sentence structure of the original content, the detected numerical representation denoting a value associated with the subject; retrieving one or more perspectives from a database by searching the database using the detected subject and the associated numerical representation as one or more keywords, the one or more retrieved perspectives individually including a re-expression of information contained in the detected numerical representation regarding the subject; and outputting the original content with the generated one or more perspectives as an annotated content.