A device, and an adjustable parameter adjustment method for a device, where the device includes a touchscreen, and the touchscreen includes a touch sensor and a fingerprint sensor. A processor first adjusts a value of an adjustable parameter to a first value according to touch input of a user on the touch sensor, then receives accurate fingerprint input using the fingerprint sensor, and accurately adjusts the value of the adjustable parameter from the first value to a second value according to the fingerprint input in order to facilitate use for the user.