The present invention relates to a TDMA communication system using the position movement of a time slot. The TDMA communication system includes a TDMA network, a network central station, and terminals. The network central station includes a receiver for receiving transmission cycle information and time slot allocation requests from the terminals, a network central station controller for writing a degree of identification for the number of cases of time slot allocation according to the information transmission cycle, searching for an allocable optimum time slot, and withdrawing a time slot from a terminal which has finished communication, a time slot management unit for allocating a time slot to the terminal based on degree of identification for the number of cases of time slot allocation written by the network central station controller, and a transmitter for transmitting information about the allocated time slot to the terminal.