An optical touch apparatus and an optical touch method are disclosed. The optical touch apparatus comprises a touch panel, a first optical sensor, a second optical sensor and a processor. The first optical sensor senses a light pen to output a first sensing signal. The second optical sensor senses the light pen to output a second sensing signal. The processor decides a threshold value according to the second sensing signal, and determines whether the first sensing signal is greater than the threshold value. The processor determines that the light pen touches the touch panel if the first sensing signal is greater than the threshold value.