To allow a security code to be inputted by a due user even when the user loses a remote controller in in-vehicle equipment with a security function.

When power is fed from an in-vehicle battery to this device, the device switches an operation mode to a security mode, and instructs to the user on a display screen so as to input the security code by a ten-key of the remote controller (step S12). Next, the device monitors the input of the remote controller and a specified secret key of function keys (steps S13 and S16). When the specified secret key is inputted in the step S16, the number of times of the input is counted, the number of times of the operation of the secret key is compared with the value of each digit of the preset security code. When they match values in all digits, the device switches the operation mode from the security mode to a normal use mode.