Regarding Filter HTML input option I want to allow one more tag in Filter html Allowed HTML tags: &lt;a> &lt;em> &lt;strong> &lt;cite> &lt;code> &lt;ul> &lt;ol> &lt;li> &lt;dl> &lt;dt> &lt;dd>
&lt;blockquote>. 

I want to add &lt;table> in this list. How can I edit this and in which hook I can modify this.

Anyone can help me?
You don't need any hook for this. Go to Configuration > Text formats (path may vary slightly, but it is available in versions 6 to 8) and simply add tags to the list: