A terminal device which is configured so as to be able to communicate with room parent devices installed in respective rooms, comprising: an input unit configured to enable input of at least a dweller name as a call manipulation for calling a particular room parent device ; a storage unit configured to store a call table in which a room number, at least a dweller name, and room parent device identification information assigned to each of the room parent devices are correlated with each other; and a control unit configured to determine a call target room parent device on the basis of an input content of the call manipulation and the call table and configured to perform a call control for calling the determined room parent device, characterized in that : in adding a new dweller name for an existing room number to the call table stored in the storage unit, the control unit is configured to automatically register, as room parent device identification information of the new dweller name, the room parent device identification information that is already assigned to the same room number; and wherein in deleting the last remaining already registered dweller name for an existing room number from the call table stored in the storage unit, the control unit is configured to automatically not delete room parent device identification information that is correlated with the dweller name to be deleted. an input unit configured to enable input of at least a dweller name as a call manipulation for calling a particular room parent device ; a storage unit configured to store a call table in which a room number, at least a dweller name, and room parent device identification information assigned to each of the room parent devices are correlated with each other; and a control unit configured to determine a call target room parent device on the basis of an input content of the call manipulation and the call table and configured to perform a call control for calling the determined room parent device, characterized in that : in adding a new dweller name for an existing room number to the call table stored in the storage unit, the control unit is configured to automatically register, as room parent device identification information of the new dweller name, the room parent device identification information that is already assigned to the same room number; and wherein in deleting the last remaining already registered dweller name for an existing room number from the call table stored in the storage unit, the control unit is configured to automatically not delete room parent device identification information that is correlated with the dweller name to be deleted. in adding a new dweller name for an existing room number to the call table stored in the storage unit, the control unit is configured to automatically register, as room parent device identification information of the new dweller name, the room parent device identification information that is already assigned to the same room number; and wherein in deleting the last remaining already registered dweller name for an existing room number from the call table stored in the storage unit, the control unit is configured to automatically not delete room parent device identification information that is correlated with the dweller name to be deleted. <EOS>