Based on one of the example posted How to create new table environment, I modified to my needs,
\documentclass{article}
\makeatletter
\usepackage[labelformat=empty]{caption}
\usepackage{tikz}
\usetikzlibrary{positioning,shapes,shadows,arrows}
\usetikzlibrary{fit,shapes.geometric}
\newcounter{nodemarkers}
\newcommand\circletext[1]{%
\tikz[overlay,remember picture]
\node (marker-\arabic{nodemarkers}-a) at (0,1.5ex) {};%
#1%
\tikz[overlay,remember picture]
\node (marker-\arabic{nodemarkers}-b) at (0,0){};%
\tikz[overlay,remember picture,inner sep=2pt]
\node[draw,ellipse,fit=(marker-\arabic{nodemarkers}-a.center) (marker-\arabic{nodemarkers}-b.center)] {};%
\stepcounter{nodemarkers}%
}
\newcommand{\nl}{\newline}
\newcounter{nodecount}
\newcommand\tabnode[1]{\addtocounter{nodecount}{1} \tikz \node (\arabic{nodecount}) {#1};}
\tikzstyle{every picture}+=[remember picture,baseline]
\tikzstyle{every node}+=[inner sep=0pt,anchor=base,
minimum width=1cm,align=center,text depth=0.5ex,outer sep=1pt]
\tikzstyle{every path}+=[thick, rounded corners]
\begin{document}
\def\starttable#1{%
\renewcommand{\arraystretch}{1.1}%
\minipage{0.45\textwidth}
\captionof{table}{#1}
\tabular{p{1cm}p{1cm}p{1cm}p{1cm}}
}
\def\stoptable{%
\endtabular
\endminipage\hspace{30pt}}
\def\R #1|#2|#3|#4{ #1}
\newpage
\begin{table}[h]
\centering
\starttable{}
\R test \nl text1 \nl text2|test|test|test\\
\R test|test|test|test\\
\R test|test|test|test\\
\stoptable
%
\starttable{}
\R \tabnode{test \nl text3 \nl text4}|test|test|test\\
\R test|test|test|test\\
\R test|test|test|test\\
\stoptable
\end{table}
\begin{tikzpicture}[overlay]
\draw [red] (1.west) -- (1.north west) -- (1.north east) -- (1.south east) -- (1.south west) -- cycle;
\end{tikzpicture}
\end{document}




\documentclassand the appropriate packages it is difficult to know. But you could try addingtext width=<length>options to thenodes. – Peter Grill Apr 04 '12 at 15:39