To facilitate to view the patient information of a patient who has made a call and the position information of the patient while protecting the individual information of patients other than the patient who has performed a calling operation displayed on a corridor light and to enable a medical worker to intuitively understand the position of the patient.

The individual information of the patients using beds is displayed in a plurality of display areas (a) to (d) divided corresponding to the number of beds in a normal state, and when a calling operation is performed, the display area (a) of the patient who has performed the calling operation is enlarged and displayed A so as to cover the individual information in the display areas (b) to (d) of the patients other than the patient who has performed the calling operation and make a part of the entire display areas (a) to (d) visible, and the display area (a) is displayed a' so as to be different from the other display areas (b) to (d). Thus, the medical worker feels it easy to view the patient information and position information of the patient who has performed the calling operation and is capable of intuitively understanding the position of the patient. Also, the individual information of the other patients is protected.