A determination method executed by a computer that serves as an authentication apparatus for a program that operates on a device, the determination method includes counting a number of times of execution of a first process related to the device and determining, in a case where an authentication request for the program that includes a number of times of execution of a second process in the device is received, whether or not it is required to verify the device based on a result of comparison between the number of times of execution of the first process and the number of times of execution of the second process.