A head mounted display, comprising: a body having a plurality of surfaces (103a, 103b, 103c, 103d, 103e, 103f); and a plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f), each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) formed on a corresponding one of the plurality of surfaces (103a, 103b, 103c, 103d, 103e, 103f) and configured to emit light to outside of the body, wherein each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) includes at least four light emitting devices that are disposed in a straight line in a spaced manner such that a specific cross ratio defines spacing for each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f), a cross ratio for four points A, B, C, D sequentially disposed on the same straight line being defined by (AC ∗ BD) / (BC ∗ AD), where AC indicates a separation distance between A and C, BD a separation distance between B and D, BC a separation distance between B and C, and AD a separation distance between A and D, a cross ratio of one of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) being different from cross ratios of other light emitting units among the plurality of light emitting units (200a, 200b, 200c, 200d, 200e,200f), and wherein each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) further includes two third light emitting devices that are disposed at a position that is distant from the straight line and is configured to emit light of a constant brightness, and the two third light emitting devices are arranged such that a straight line formed by any two among the at least four light emitting devices and a straight line formed by the two third light emitting devices are not parallel to each other. a body having a plurality of surfaces (103a, 103b, 103c, 103d, 103e, 103f); and a plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f), each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) formed on a corresponding one of the plurality of surfaces (103a, 103b, 103c, 103d, 103e, 103f) and configured to emit light to outside of the body, wherein each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) includes at least four light emitting devices that are disposed in a straight line in a spaced manner such that a specific cross ratio defines spacing for each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f), a cross ratio for four points A, B, C, D sequentially disposed on the same straight line being defined by (AC ∗ BD) / (BC ∗ AD), where AC indicates a separation distance between A and C, BD a separation distance between B and D, BC a separation distance between B and C, and AD a separation distance between A and D, a cross ratio of one of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) being different from cross ratios of other light emitting units among the plurality of light emitting units (200a, 200b, 200c, 200d, 200e,200f), and wherein each of the plurality of light emitting units (200a, 200b, 200c, 200d, 200e, 200f) further includes two third light emitting devices that are disposed at a position that is distant from the straight line and is configured to emit light of a constant brightness, and the two third light emitting devices are arranged such that a straight line formed by any two among the at least four light emitting devices and a straight line formed by the two third light emitting devices are not parallel to each other.