BOS TWR ADVISES LNDG B738 TO GO AROUND AS B732 DEPARTS FROM INTERSECTING RWY. LNDG ACFT REFUSES CLRNC.

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CLRED TO LAND ON BOS RWY 27. AT APPROX 2-3 MI FROM RWY; WERE ADVISED BY CTLR THAT TFC WAS DEPARTING ON THE 'XING RWY.' WE SAW TFC ROLLING ON RWY 22R; AND THOUGHT THAT WAS THE TFC HE WAS REFERRING TO. ON SHORT FINAL; THE CTLR SAID 'ACR X.' A FEW SECONDS LATER; AS WE WERE IN THE LNDG FLARE; WE SAW AN ACR Y FLT JUST LIFTING OFF RWY 15R. JUST PRIOR TO THE INTXN OF RWY 27 AND RWY 15R; AT THAT SAME MOMENT; THE CTLR SAID 'ACR X; GO AROUND.' I VERY QUICKLY DECIDED THAT WAS NOT A GOOD MOVE; AND JUST SAID 'NO' TO MY COPLT; WHO RELAYED A 'NEGATIVE' ON THE FREQ. THE CTLR THEN SAID 'OK; CLRED TO LAND.' AFTER ARRIVING AT THE GATE; I CALLED THE TWR AND TALKED TO MR X; THE SUPVR. HE SAID HE HAD NO PROB WITH THE FLC ACTIONS IN THIS EVENT; AND WAS GLAD I DID NOT DO THE REJECTED LNDG. HE SAID THIS WAS A CTLR ERROR. I SUGGESTED TO HIM THAT THE TWR SHOULD NOT BE USING DIFFERENT FREQS FOR OPS ON XING RWYS. SUPPLEMENTAL INFO FROM ACN 509805: EACH ACFT WAS ON A DIFFERENT TWR FREQ; SO WE DIDN'T HEAR THE OTHER ACFT CLRED FOR TKOF. THIS CONTRIBUTED TO OUR NOT SEEING THE OTHER ACFT UNTIL THE LAST MOMENT.