Is there a way to combine the graphic of a ListPlot to the graphic of a Plot? (I need to plot a graphic of a function on the graphic of a ListPlot)
You can combine any graphics with the Show function like so:
Show[myListPlot, myPlot]
This generalizes to combining any number of plots at once: Show[p1, p2, p3, p4, ...] or Show[{p1,p2,p3,p4,...}]
Reference and image source: http://reference.wolfram.com/mathematica/ref/Show.html


You can use Epilog as well if Show is not stacking the graphics in the correct order, but combining more than 2 graphics with Epilog will be unwieldy.