B737 FLT CREW ON PRACTICE LOC APPROACH IN VMC TO SJC RWY 30L RECEIVES GPWS WARNING APPROACHING FORUL AND CONTINUES TO LANDING.

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WE WERE PRACTICING A LOC (GS OUT) TO RWY 30L; SJC. WE WERE ON THE PUBLISHED APCH; DSNDING FROM THE FAF ALT OF 2700 FT MSL (9.4 DME). WE GOT A GS ALERT; WHICH WE EXPECTED BECAUSE THE ILS WAS OPERATIONAL. WE WERE DSNDING AT 1200 FPM AT ABOUT 7.0 DME AND ABOUT 1600 FT MSL WHEN WE GOT A 'CAUTION OBSTACLE' FOR ABOUT 3 SECONDS. HAVING JUST HEARD THE GS ALERT; I MISINTERPED THE 'CAUTION OBSTACLE' ALERT AND DID NOT PERFORM A GAR. WE WERE NOT EXPECTING A DEV ALERT BECAUSE WE WERE ON THE PROPER LOC-ONLY PROFILE; ON COURSE AND 1200 FPM. IT WAS NIGHT VMC WITH THE BUILDINGS OF SAN JOSE WELL AHEAD AND CLEARLY BELOW US. AFTER LNDG; WE REVIEWED APCH AND REALIZED WE SHOULD HAVE PERFORMED A GAR. NEXT TIME I WILL LISTEN CLOSELY TO EACH SEPARATE ALERT AND NOT BECOME COMPLACENT; EVEN IN VMC AND ON THE PARAMETERS OF A PUBLISHED APCH. SUPPLEMENTAL INFO FROM ACN 790860: WE BRIEFED AND SET UP FOR A PRACTICE NON-PRECISION APCH TO RWY 30 AT SJC. THE ILS WAS FULLY OPERATIONAL. WE GOT A FEW GS ALERTS AS WE ANTICIPATED. DURING THOSE ALERTS AND LEVEL AT MDA; WE RECEIVED AN 'OBSTACLE ALERT' ON SHORT FINAL. THE CAPT RESPONDED RWY IN SIGHT LNDG. FLT ENDED WITH NO INCIDENT. WE DEBRIEFED AT THE HOTEL AND REALIZED OUR MISTAKE OF MISSING THE OBSTACLE ALERT GIVEN WITH THE SAME TIME AS THE GS ALERT. THE PROPER ACTION SHOULD HAVE BEEN TO GO AROUND. IN THE FUTURE; I WILL LISTEN MORE CLOSELY TO THE ALERTS BEING GIVEN AND BRIEF PRIOR TO A NON-PRECISION APCH BEING FLOWN EITHER VMC OR IMC TO BRIEF THE POSSIBILITY OF THE OBSTACLE ALERT AND THAT A GAR WILL BE EXECUTED.