An edge device is configured to automatically establish a connection with a remote monitoring device when an abnormality has occurred in a plant. The edge device includes a controller configured to detect the abnormality based on data regarding an observation target device, and a connection establishment unit configured to establish a connection with the remote monitoring device such that the remote monitoring device is able to remotely access the edge device when the controller has detected the abnormality and determined that the abnormality matches a predetermined condition, wherein the remote access is a connection for remotely checking a state of the observation target device, or for enabling a remote manipulation of the observation target device.