To provide an electricity rate charging system and method for calculating an electricity rate to be charged while considering a burden on a user required for online meter inspection for transmitting meter inspection data through the user's cellular phone as a discount charge.

In the electricity rate charging system 100, when the cellular phone 20 which receives a message from an electricity rate processor 60 transmits measurement data of an online meter inspection device 10 to the processor 60, the processor 60 calculates an electricity rate based on the measurement data, calculates a telephone rate by subtracting a telephone rate required for communication of the measurement data by the cellular phone 20 and a predetermined fee from a telephone rate, transmits amount charged electricity rate data to the cellular phone 20, accumulates each calculated data, and outputs it by a chart and figure.