PURPOSE: To realize the time slot signal phase aligner device which can absorb a frame phase difference between all channels (time slot units), at the time of data multiplex communication, and dispenses with giving control information between each device for executing a communication.

CONSTITUTION: A frame synchronizing code is inserted periodically into all time slots of transmitting data in which plural data are multiplexed by a frame/ multi-frame synchronizing code inserting part 11, and also, a multi-frame synchronizing code for specifying the time slot of the frame synchronizing code is inserted into a specific time slot, and from in the time slot of received data containing these synthronizing codes, the multi-frame synchronizing code is detected from a multi-frame synchronization detecting part 19. In a frame detecting part 20, a frame phase of all time slots is detected, based on this multi-frame synchronizing code, and the frame alignment of the received data is executed.