A nurse call system comprising: a nurse call slave unit provided for patient-use; a nurse call master unit (11, 21) having the nurse call slave unit connected thereto; a mobile terminal (13, 14, 24) carried by a healthcare worker; an access point (12,22) for relaying communications between the mobile terminal (13, 14, 24) and the nurse call master unit (11, 21); a private branch exchange having a plurality of the nurse call master unit (11, 21) installed in a facility connected thereto and being configured to control communications between the nurse call slave unit and the mobile terminal (13, 14, 24); and a chat server configured to generate a chat room to be delivered to the mobile terminal (13, 14, 24) in response to a call originated from the nurse call slave unit, wherein the private branch exchange has first information indicating corresponding relationship between the mobile terminal (13, 14, 24) and the healthcare worker, second information indicating corresponding relationship between the patient and an in-charge healthcare worker who is in charge of the patient among the healthcare workers, and third information indicating location information of the nurse call slave unit and the mobile terminal (13, 14, 24), and the chat server is configured to generate, based on the first and the third information, a chat room with the in-charge healthcare worker in charge of a subject patient who originated a call using the nurse call slave unit and a nearby healthcare worker assumed to be at a location closer to the subject patient than the in-charge healthcare worker is as users, and to provide the chat room to each mobile terminal (13, 14, 24) held by the in-charge healthcare worker and the nearby healthcare worker. a nurse call slave unit provided for patient-use; a nurse call master unit (11, 21) having the nurse call slave unit connected thereto; a mobile terminal (13, 14, 24) carried by a healthcare worker; an access point (12,22) for relaying communications between the mobile terminal (13, 14, 24) and the nurse call master unit (11, 21); a private branch exchange having a plurality of the nurse call master unit (11, 21) installed in a facility connected thereto and being configured to control communications between the nurse call slave unit and the mobile terminal (13, 14, 24); and a chat server configured to generate a chat room to be delivered to the mobile terminal (13, 14, 24) in response to a call originated from the nurse call slave unit, wherein the private branch exchange has first information indicating corresponding relationship between the mobile terminal (13, 14, 24) and the healthcare worker, second information indicating corresponding relationship between the patient and an in-charge healthcare worker who is in charge of the patient among the healthcare workers, and third information indicating location information of the nurse call slave unit and the mobile terminal (13, 14, 24), and the chat server is configured to generate, based on the first and the third information, a chat room with the in-charge healthcare worker in charge of a subject patient who originated a call using the nurse call slave unit and a nearby healthcare worker assumed to be at a location closer to the subject patient than the in-charge healthcare worker is as users, and to provide the chat room to each mobile terminal (13, 14, 24) held by the in-charge healthcare worker and the nearby healthcare worker.