A method for protecting confidential information in an EV power transfer system includes determining whether there is an abnormality in a storage device in which confidential information for transferring electric power from a charging station to the EV is stored. The method further includes transmitting a message warning a risk of leakage of the confidential information when it is determined that there is the abnormality in the storage device. An apparatus for protecting confidential information in an EV power transfer system includes a processor and a memory storing instructions that cause the processor to perform the method.