that record is based on historical land and sea surface thermometer measurements with missing readings filled in by statistical and other tricky methods. See a full discussion of the (in)significance of the 2014 result here.
However, there's another record considered to be somewhat more reliable than surface thermometer readings - and that is the University of Alabama in Huntsville (UAH) Satellite Based Temperature of the Global Lower Atmosphere. That record shows "2014 was Third Warmest Year Since 1979, but Just Barely":
Update: Updates on all the global temp data sets: the three surface temp data sets (GSS, NCDC and HADCRUT) and the satellite data sets (UAH and RSS).
Update: 2014: The Most Dishonest Year on Record
... What remains of the original description of this ‘warmest year on record’ news? Nothing but bluff, spin, and the uncritical press-release journalism that dominates mainstream reporting on the climate. ...