Input apparatus, input mode switching method and computer apparatus

The present disclosure provides an input apparatus, which is coupled to a handheld electronic device. The input apparatus includes a touchpad and a processing unit. The touchpad includes a button region having a plurality of virtual buttons defined therein. The touchpad is used for sensing a touch gesture of a user over the button region and correspondingly generating a touch coordinate data and a touch pressure value. The processing unit is coupled to the touchpad. The processing unit determines whether to cause the handheld electronic device to enter a keyboard mode or a cursor control mode according to the touch pressure value. When the input apparatus operates in the keyboard mode, the processing unit outputs a button signal to the handheld electronic device. When the input apparatus operates in the cursor control mode, the processing unit outputs a cursor control signal to the handheld electronic device.