Abstract: A handheld device having an auto-volume control means for earphone plugging and the controlling method thereof is provided. A first preset volume value and a second preset volume value are set by a user to adjust the volume of an earphone and a speaker separately. Since output volume to the earphone and the speaker is under separate control, there is no need to readjust volume when the earphone is plugged in or unplugged. In addition, an over-volume protection and earphone volume micro-adjustment function are also incorporated to improve operation.