To provide an entrance and exist managing system and a fire informing system for making it impossible to enter a room in which no one is present by selectively turning the electric lock of the room into a locked state at the time of the generation of fire.

At the time of the generation of fire, a fire informing system 1 judges whether or not a burglar preventing sensor 4 is in an operating state, forcedly turns it into the operating state for confirming the presence or absence of a person in a room at the time of judging that it is not in the operating state, adds the result to an information signal for reporting the generation of fire, and transmits it to an entrance and exist managing system 10. On the other hand, the entrance and exit managing system 10 receives the information signal to which the absence information is added, and turns an electric lock 13 of the room in which no one is present into a locked state.