PURPOSE: To improve the possibility of elimination of unarrival due to re- transmission with respect to the communication condition revision system in a communication equipment provided with a re-transmission function.

CONSTITUTION: The system is provided with a communication equipment 200 having a re-transmission function to a terminal equipment 100 to be accommodated. The communication equipment 200 is provided with a communication condition revision means 201 which revises the communication condition to send again information to the terminal equipment 100 next time depending on the preceding state of unarrival of information (such as increase in transmission level from communication equipment when reply wait time expires at terminal equipment and extension of reply watchdog timer in the case of collision of transmission control information) when the transmission of information to the terminal equipment 100 is not reached.