Load hyperref with suitable options. For example,ggyyree wrote:how to change the color of the footmark now please?
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\usepackage[colorlinks,linkcolor=blue]{hyperref}
This can be solved, to my knowledge, if the two footmarks come one right after another. For example, to getggyyree wrote: I also met a problem that two footmarks need to be referred to the same footnote. How to do that please?

you could write
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Text\footnote{Blah blah}. More text\footnote{Blah blah blah}. And even more text\SameFootnotemark.
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\newcommand{\SameFootnotemark}{\addtocounter{footnote}{-1}\addtocounter{Hfootnote}{-1}\footnotemark}

Do you see the difference? The last footmark is not equal to the preceding one, but the first one.
This kind of matters are hard. In fact, when reading the very complex code of hyperref, one realizes that \footnote, \footnotemark and \footnotetext are redefined without optional arguments.
Finally, to get the last table you mentioned, write
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\begin{center}
\begin{tabular}{cccc}
N &aaa &bbb &ccc\Footnotemark\\
N &111\SameFootnotemark &222\Footnotemark &333
\end{tabular}
\end{center}
\addtocounter{footnote}{-1}\Footnotetext{Test1}
\stepcounter{footnote}\Footnotetext{Test2}