A communication apparatus comprising: a regular optical transceiver including a first number of optical transceivers (11-14) to each generate a regular subcarrier signal serving as a subcarrier signal; a narrowband optical transceiver including a second number of optical transceivers each capable of generating a narrowband subcarrier signal serving as a subcarrier signal having a narrower frequency band than the regular subcarrier signal; and a subcarrier configuration determiner to determine a configuration of a plurality of componential subcarrier signals in a super-channel signal, based on information on the number of optical filter stages to pass through, which is information on the number of optical filters through which the super-channel signal containing the plurality of componential subcarrier signals passes in a transmission path when the super-channel signal is transmitted to a counterpart communication apparatus , wherein the plurality of componential subcarrier signals consists of the first number of regular subcarrier signals and the second number of narrowband subcarrier signals; wherein the regular optical transceiver is arranged to shift positions of the regular subcarrier signals in the super-channel signal, according to optical frequency shift amounts indicating shift amounts of the plurality of componential subcarrier signals indicated by the configuration determined by the subcarrier configuration determiner , and the narrowband optical transceiver is arranged to shift positions of the narrowband subcarrier signals in the super-channel signal, according to the optical frequency shift amounts. a regular optical transceiver including a first number of optical transceivers (11-14) to each generate a regular subcarrier signal serving as a subcarrier signal; a narrowband optical transceiver including a second number of optical transceivers each capable of generating a narrowband subcarrier signal serving as a subcarrier signal having a narrower frequency band than the regular subcarrier signal; and a subcarrier configuration determiner to determine a configuration of a plurality of componential subcarrier signals in a super-channel signal, based on information on the number of optical filter stages to pass through, which is information on the number of optical filters through which the super-channel signal containing the plurality of componential subcarrier signals passes in a transmission path when the super-channel signal is transmitted to a counterpart communication apparatus , wherein the plurality of componential subcarrier signals consists of the first number of regular subcarrier signals and the second number of narrowband subcarrier signals; wherein the regular optical transceiver is arranged to shift positions of the regular subcarrier signals in the super-channel signal, according to optical frequency shift amounts indicating shift amounts of the plurality of componential subcarrier signals indicated by the configuration determined by the subcarrier configuration determiner , and the narrowband optical transceiver is arranged to shift positions of the narrowband subcarrier signals in the super-channel signal, according to the optical frequency shift amounts. <EOS>