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. The invention can enhance the user's operating convenience while effectively reduce the area needed as well as and lower the associated production cost.