An information output device includes an acquisition unit (control unit) and an output unit. The acquisition unit acquires, from a communication terminal, information on a use period of the communication terminal through communication therewith. The output unit outputs information based on the acquired information on the use period. An information output method includes a step of acquiring, from a communication terminal, information on a use period of the communication terminal through communication therewith and a step of outputting information based on the information on the use period. A non-transitory computer-readable storage medium storing a program according to an embodiment of the present invention executes a function to acquire, from a communication terminal, information on a use period of the communication terminal through communication therewith and a function to output information based on the information on the use period.