Provided is a communication system that, in using a communication scheme such as TD-LTE, may attain a high speed communication by securing a bandwidth of carriers and prevent radio interference with another system by keeping the carriers within a frequency band assigned to the communication scheme. Specifically, the communication system having a plurality of communication apparatuses for carrying out a radio communication by assigning the plurality of communication apparatuses to a second frequency band with a predetermined bandwidth to be exceeded by carriers serially assigned, assigns the carriers to the second frequency band in such a manner as to overlap a portion of each of the carriers, and a communication apparatus (10a) using one of the carriers and a communication apparatus (10b) using the other carrier carry out the radio communication by preferentially using respective ranges of the overlapping portion.