Assistance in performing an action for a detected event for a monitoring target resource whose connection is not an always-on connection to perform an appropriate action as soon as possible in response to occurrence of a failure. The assistance device stores, in association with an occurrence pattern of an event, information related to plural tasks for determining whether a predetermined condition is fulfilled, and an action to be performed by a corresponding device. Then, the assistance device calculates an index value for determining the level of probability of the occurrence pattern of the event, determines whether the calculated index value is larger than a predetermined value, and sends, to a device to perform the action, the occurrence pattern of the event the index value of which is determined to be larger than the predetermined value, and information related to the plural tasks and the action corresponding to the occurrence pattern.