1. An apparatus for detecting sentence boundaries, comprising: a sentence boundary candidate extracting unit extracting a sentence boundary candidate from an input document; a document context analyzing unit extracting features from information on preceding and following contexts of the sentence boundary candidate, the features being used in two or more statistical algorithms; a sentence boundary candidate classifying unit classifying whether the sentence boundary candidate is a sentence boundary or not, using the features and the two or more statistical algorithms; and a sentence generating unit extracting sentence units from the document based on a result of the classification of whether the sentence boundary candidate is a sentence boundary or not.