\begin{document}
\tableofcontents
\include{chapter1}
\bibliographystyle{plain}
\bibliography{biblio}
\end{document}


\usepackage[nottoc,numbib]{tocbibind}


the bibliography will appear as a chapter in my document!!

To get the bibliography to be listed in the ToC as an unnumbered sectional unit (chapter or section), use tocbibind without the numbib option:

\usepackage[nottoc,notlot,notlof]{tocbibind}


Another option would be to use the etoolbox package to patch \thebibliography to use \addcontentsline:

\documentclass{book}
\usepackage{etoolbox}