A flash memory device includes a memory cell array connected with word lines and control logic that performs threshold voltage compensation on the word lines through a data recover read operation. When a word line on which programming is performed after a selected word line is a dummy word line, the control logic performs the threshold voltage compensation on the selected word line based on a result of a data recover read operation of a word line on which programming is performed before the selected word line. When a next word line on which programming is performed after a selected word line is a dummy word line, the control logic performs threshold voltage compensation on the selected word line based on a result of performing the data recover read operation on a previous word line on which programming is performed before the selected word line.