G4 FLT CREW LANDING IAH REQUESTS ILS 26L AND IS LATER CLEARED FOR ILS 27. FLT CREW REPROGRAMS FMC BUT DOES NOT CHANGE ILS FREQUENCY. OVERSHOOT NORTH OF COURSE OCCURS BEFORE CORRECTION IS INITIATED.

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APCHING IAH FROM THE SW; GLAND 3 ARR. CAPT PF; MYSELF BRIEFED AN ILS RWY 27 AS THE STANDARD APCH WHEN ARRIVING ON THE GLAND 3 ARR FROM THE SW. CO-CAPT PNF; SAID NO; HE'D ASK FOR THE ILS RWY 26L; AND HE SET UP THE ILS RWY 26L AND REQUESTED IT UPON INITIAL CONTACT WITH HOUSTON APCH; BUSY CTLR DIDN'T ADVISE APCH UNTIL MUCH LATER AND SAID EXPECT THE ILS RWY 27. CO-CAPT REPROGRAMMED THE FMS; BUT PUT THE WRONG LOC FREQ IN THE NAV RADIOS. CAPT; PF OVERSHOT LOC. CAPT WENT TO GREEN NEEDLE; RAW DATA AS REQUIRED BY THE G4 FLT MANUAL. CAPT REACTED WITH A L TURN WHEN NOTICED ON THE MFD; ACFT WAS R OF COURSE; EVEN THOUGH GREEN COURSE NEEDLE HAD NOT MOVED DUE TO WRONG FREQ DIALED IN. ATC NOTICED AT ABOUT THE SAME TIME AND INSTRUCTED A MORE AGGRESSIVE L TURN TO INTERCEPT THE LOC. NO CONFLICTS NOTED. ACFT CORRECT ASAP AND LANDED NORMALLY AS DID ACFT IN FRONT; BEHIND AND BESIDE G4. SUGGEST AMENDING ATIS TO INCLUDE ACTIVE APCHS FROM ARRS; JUST LIKE MOST ICAO COUNTRIES DO. DON'T CHANGE APCHS SO CLOSE TO ARPT.