An information output method in an information output device acquires first information on an operation history of one or more devices operated by one or more users, acquires second information that identifies a user detected in the vicinity of one or more output devices, acquires third information on behavior of the user, identifies a device whose state is changed or whose state is changeable within a predetermined time among the one or more devices and an operator who performs operation relating to the change in the state based on the first information, determines an output mode and content of notification information on the identified device to the detected user based on information on the identified device and operator, the second information, and the third information, and outputs, in the determined output mode, notification information having the determined content to one or more output devices that detect the detected user.