7. A system comprising: a processor; a memory coupled to said processor and comprising instructions that, when executed by said processor, causes the processor to perform a method of annotating said electronic book by use of information from one or more information source sites, said method comprising: accessing an information source site hosted by a server system, said information source site comprising plurality of webpages, each webpage associated with a subject title; accessing a portion of said electronic book; identifying a first plurality of terms from said electronic book, each term of said first plurality of terms related to one or more webpages of said information source site; matching each term of said first plurality of terms to a respective webpage of said information source site based on a context of said electronic book at least by disambiguating a first term within said first plurality of terms to a single matching webpage based on relatedness of said first term with other terms of said first plurality of terms, wherein said first term is associated with multiple webpages of said information source site, and wherein said relatedness is determined in accordance with a respective similarity between each of said multiple webpages associated with said first term and each webpage associated with each of said other terms of said first plurality of terms; mining data of said information source site to create an index to all subject titles therein and a graph structure of incoming links to said all subject titles; computing similarity scores in accordance with an incoming link dependent measure; deriving said relatedness by computing a weighted average to similarity scores associated with said first term, wherein said weighted average is computed based on weight factors determined in accordance with relatedness among terms of said other terms; obtaining a second plurality of terms by filtering said first plurality of terms based on a predetermined criteria; and establishing hyperlinks between said second plurality of terms with respective matching webpages of said information source site, said respective matching webpages associated with respective matching subject titles, wherein the link dependent measure is based on a first equation sim ⁡ ( c j , p i ) = log ⁡ ( max ⁡ (  c j  ,  p i  ) ) - log ⁡ (  c j ⋂ p i  ) log ⁡ (  W  ) - log ⁡ ( min ⁡ (  c j  ,  p i  ) ) , wherein pi corresponds to a target term with multiple matching title pages, cj corresponds to pages of unique entries among context terms for the target term, and W corresponds to a collection of webpage titles.
7. A system comprising: a processor; a memory coupled to said processor and comprising instructions that, when executed by said processor, causes the processor to perform a method of annotating said electronic book by use of information from one or more information source sites, said method comprising: accessing an information source site hosted by a server system, said information source site comprising plurality of webpages, each webpage associated with a subject title; accessing a portion of said electronic book; identifying a first plurality of terms from said electronic book, each term of said first plurality of terms related to one or more webpages of said information source site; matching each term of said first plurality of terms to a respective webpage of said information source site based on a context of said electronic book at least by disambiguating a first term within said first plurality of terms to a single matching webpage based on relatedness of said first term with other terms of said first plurality of terms, wherein said first term is associated with multiple webpages of said information source site, and wherein said relatedness is determined in accordance with a respective similarity between each of said multiple webpages associated with said first term and each webpage associated with each of said other terms of said first plurality of terms; mining data of said information source site to create an index to all subject titles therein and a graph structure of incoming links to said all subject titles; computing similarity scores in accordance with an incoming link dependent measure; deriving said relatedness by computing a weighted average to similarity scores associated with said first term, wherein said weighted average is computed based on weight factors determined in accordance with relatedness among terms of said other terms; obtaining a second plurality of terms by filtering said first plurality of terms based on a predetermined criteria; and establishing hyperlinks between said second plurality of terms with respective matching webpages of said information source site, said respective matching webpages associated with respective matching subject titles, wherein the link dependent measure is based on a first equation sim ⁡ ( c j , p i ) = log ⁡ ( max ⁡ (  c j  ,  p i  ) ) - log ⁡ (  c j ⋂ p i  ) log ⁡ (  W  ) - log ⁡ ( min ⁡ (  c j  ,  p i  ) ) , wherein pi corresponds to a target term with multiple matching title pages, cj corresponds to pages of unique entries among context terms for the target term, and W corresponds to a collection of webpage titles. 9. The system of claim 7 , wherein webpages in said information source site comprises contents selected from a group consisting of texts, audios, videos, images, and combinations thereof.