In a transmitting apparatus 101, there are provided PLL circuit 601 for generating high-speed clock signals up to 2.sup.m times (m being a positive integer) from a basic clock signal, and a clock generating circuit 600 for generating a communication clock signal (S-CLOCK) and a reception timing signal (S-LATCH*) as independent clocks of any time length with using the generated high-speed clock signal as the smallest unit.