To determine whether a personal computer in an emergency report system is disconnected from a network due to theft as accurately as possible to make a notification.

An emergency report system has a plurality of personal computers 10 that manage emergency call devices 1 for respective dwelling units, and the personal computers 10 are connected by a network and managed by a server computer 20. A determination part 24 determines whether a personal computer 10 on which an application associated with the emergency report system is activated and from which the network is disconnected exists. When the determination part 24 determines a personal computer 10 on which the application is activated and from which the network is disconnected exists, a control part 21 makes a notification of theft of the personal computer 10 on other personal computers 10.