PURPOSE: To surely connect reread and reproduced data in a digital signal recording medium reproducing device pre-reading a signal from signal recording medium, storing the reproduced data in a memory once, and consequently, capable of rereading reproduced data which is unread.

CONSTITUTION: Address information included in specified written reproduced data written in the memory 10 is stored in a register 17, then address information included in reproduced data which is reproduced newly and before writing is compared with the address information stored in the relevant register 17 as reference. Then, the succession between the written reproduced data and the before-writing reproduced data is detected by a succession detecting means 18 and the reproduced data which is written in the memory 10 is judged.