Two parents menu

Hello everybody. I have a problem and I've searched two days for a solution but I find nothing. I'm using Taxonomy Menu to structure my website and Nice Menus to display them. When I create content, I choose one or two terms (multiple hierarchy) from my vocabulary because I want to show my content in "News" category and in its model category, but when submit, the node created don't display in the menu. To make that node display in menu I have to indicate in the content creation form, in menu setting what is the parent, but only can choose one parent when I want two parents for that node...

Can anybody help me?? Any module or any php code to display taxonomy menu and node descendants...

Thanks in advance.