A nurse call system comprising: a nurse call slave unit provided for patient-use; a nurse call master unit having the nurse call slave unit connected thereto; a mobile terminal carried by a healthcare worker; an access point for relaying communications between the mobile terminal and the nurse call master unit ; a private branch exchange having a plurality of the nurse call master unit installed in a facility connected thereto and being configured to control communications between the nurse call slave unit and the mobile terminal ; and a chat server configured to generate a chat room to be delivered to the mobile terminal 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 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 , 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 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 having the nurse call slave unit connected thereto; a mobile terminal carried by a healthcare worker; an access point for relaying communications between the mobile terminal and the nurse call master unit ; a private branch exchange having a plurality of the nurse call master unit installed in a facility connected thereto and being configured to control communications between the nurse call slave unit and the mobile terminal ; and a chat server configured to generate a chat room to be delivered to the mobile terminal 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 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 , 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 held by the in-charge healthcare worker and the nearby healthcare worker. <EOS>