A hub apparatus provided by the present invention comprises an OTG (on-the-go) control module and at least one USB port and a linking module. The OTG control module has a buffer and be coupled to the USB port and the linking module. When the host apparatus and the peripheral apparatus link with the hub apparatus, the OTG control module captures a data, which is asserted by a user through the host apparatus, from the peripheral apparatus via the USB port, and saves the captured data into the buffer, so as to move the data saved into the buffer to the host apparatus via a data transmission for responding a data capturing requirement from the host apparatus.