A semiconductor device includes: a clock input unit configured to receive a system clock and a data clock externally; a phase dividing unit configured to generate a plurality of multi-system clocks in response to the system clock, wherein each of the multi-system clocks has an individual phase difference; a phase detecting unit configured to detect phase differences between the plurality of multi-system clock and the data clock and to generating generate a training information signal in response to the detection result; and a signal transmitting unit configured to transmit the training information signal.