Accounting method for electrical stimulation apparatus

The present invention relates to a billing method for an electric stimulator. According to an embodiment of the present invention, the billing method for an electric stimulator includes the steps of: receiving information regarding the usage rights from a second device; operating the electric stimulator based on the information regarding the usage rights; collecting the usage history of the electric stimulator; analyzing the collected usage history; and updating the received information regarding the usage rights based on the analyzed usage history.