  We propose efficient schemes for converting three-photon, four-photon and
five-photon GHZ state to a $W$ state or Dicke state, respectively with the
nitrogen-vacancy (N-V) centers via single-photon input-output process and
cross-Kerr nonlinearities. The total success probability can be improved by
iterating the conversion process for the case of three-photon and five-photon
while it does not require iteration for converting four-photon GHZ state to a
$W$ state. The analysis of feasibility shows that our scheme is feasible for
current experimental technology.
