Disclosed are a memory device and an operating method thereof, and the memory device includes a plurality of first data lines, a plurality of second data lines, a common redundant memory region coupled to at least one repair line of the second data lines, a plurality of normal memory regions coupled to the first data lines in common, and coupled in common to the remaining the second data lines excluding the repair line, and a repair circuit coupled to the first and second data lines, and suitable for replacing at least one defective memory cell in the normal memory regions with at least one redundant memory cell in the common redundant memory region by shifting some or all of the first data lines to some or all of the second data lines, based on a row address, a column address and a region address.