To provide a method for transferring data to a plurality of reception parts connected to the same bus by which a distribution waiting time being a reference waiting time required for sending a reception completion signal from the start of inputting is shortened when transferring data to the plurality of reception parts connected to the same bus.

When there is a reception part 101-1 coming into a reception impossible state due to the reception of data, a state signal outputted by a reception part except for the part 101-1 in a period when the part 101-1 is in the reference waiting time is monitored to find the state signal sowing the reception possible state. When there is a reception-enabled reception part 101-2, the part 101-2 is selected by a control signal to distribute data.