DISPLAY DEVICE

The present invention relates to a display device and a control method therefor. The display device comprises: a body including a fixed body configured to respond to an output format of various contents, and an extended body coupled to at least one corner of the fixed body so as to slide on the fixed body to expand or contract a front area; and a flexible display provided on the front surface of the body and having an output area and a non-output area rolled at an end of the output area and provided on a rear area of the output area, wherein the flexible display is configured such that the ratio of the output area to the non-output area is variable in accordance with the front area of the body.