list current custom tax as hyperlink

How do turn the listed term as a hyperlink to parent custom taxonomy? I am stuck!

<?php
	$terms = get_the_terms( $post->ID, 'program' ) ;
	$term_list = array_pop($terms)->name ;
	foreach( $terms as $os )
	{
		$term_list .= "<br> " . $os->name ;
	}
	echo $term_list ;
?>

Thank you,
JG