You're looking at the processing dates, which is for cases in process. Your father's case is not in process yet. First, his priority date, which is in 2000, should become current. What does that mean?
You need to follow the chart for family based visa bulletin at this site:
http://www.travel.state.gov/visa/frvi/bulletin/bulletin_3111.html.
These are the current dates for 4th category:
All Chargeability Areas Except Those Listed - 15FEB96
CHINA-mainland born - 22JUL95
INDIA - 08OCT95
MEXICO - 15MAR94
PHILIPPINES - 01AUG84
As you see, it's currently 15FEB96, so your father should wait 4 more years to be able to apply for permanent residency.