PURPOSE: To enable a high-speed operation by parallelly outputting data to be serially inputted for every N number of data.

CONSTITUTION: The data is read out by reading it out from data output lines 161-16N and after completely reading it out, a signal at a 1 level is inputted from a control line 174 for output. Continuously, when the control line 174 for output is turned to a 0 level and a state memory 13N+1 in set in the state of data presence, namely, in the state of Q=1, an operational state is set and the transfer of the data is started similarly to a conventional example and turned to a standstill state when the transfer of N steps is completed finally.