A spatial position indication system comprising: an indicated position detecting device unit configured to detect a first position of an electronic pen at an input surface for receiving instruction input by the electronic pen and a hover region over the input surface, wherein a position detection region, in which the first position indicated by the electronic pen can be detected by the indicated position detecting device unit, includes the input surface and the hover region; wherein the spatial position indication system further comprises a spatial position detecting device unit configured to detect a second position of the electronic pen in a spatial region including at least a part of the hover region; and a selecting unit configured to select whether to use the first position as the instruction input or use the second position as the instruction input according to a separation distance of the electronic pen from the input surface, wherein the spatial position indication system further comprises: a transforming unit configured to perform transformation from detected coordinates (X, Y, Z) of the first position in the space coordinate system of the position detection region to detected coordinates (Xs, Ys, Zs) of the second position in the space coordinate system of the spatial region, or a transforming unit configured to perform transformation from detected coordinates (Xs, Ys, Zs) of the second position in the space coordinate system of the spatial region to detected coordinates (X, Y, Z) of the first position in the space coordinate system of the position detection region, wherein the space coordinate system of the spatial region of the spatial position detecting device unit is set independently of the space coordinate system of the position detection region of the indicated position detecting device unit, wherein the spatial position indication system further comprises: a drawing image control unit configured to control a drawing image displayed on a display unit on a basis of detection output of the position indicated by the electronic pen from the indicated position detecting device unit and spatial position detection output from the spatial position detecting device. an indicated position detecting device unit configured to detect a first position of an electronic pen at an input surface for receiving instruction input by the electronic pen and a hover region over the input surface, wherein a position detection region, in which the first position indicated by the electronic pen can be detected by the indicated position detecting device unit, includes the input surface and the hover region; wherein the spatial position indication system further comprises a spatial position detecting device unit configured to detect a second position of the electronic pen in a spatial region including at least a part of the hover region; and a selecting unit configured to select whether to use the first position as the instruction input or use the second position as the instruction input according to a separation distance of the electronic pen from the input surface, wherein the spatial position indication system further comprises: a transforming unit configured to perform transformation from detected coordinates (X, Y, Z) of the first position in the space coordinate system of the position detection region to detected coordinates (Xs, Ys, Zs) of the second position in the space coordinate system of the spatial region, or a transforming unit configured to perform transformation from detected coordinates (Xs, Ys, Zs) of the second position in the space coordinate system of the spatial region to detected coordinates (X, Y, Z) of the first position in the space coordinate system of the position detection region, wherein the space coordinate system of the spatial region of the spatial position detecting device unit is set independently of the space coordinate system of the position detection region of the indicated position detecting device unit, a transforming unit configured to perform transformation from detected coordinates (X, Y, Z) of the first position in the space coordinate system of the position detection region to detected coordinates (Xs, Ys, Zs) of the second position in the space coordinate system of the spatial region, or a transforming unit configured to perform transformation from detected coordinates (Xs, Ys, Zs) of the second position in the space coordinate system of the spatial region to detected coordinates (X, Y, Z) of the first position in the space coordinate system of the position detection region, wherein the space coordinate system of the spatial region of the spatial position detecting device unit is set independently of the space coordinate system of the position detection region of the indicated position detecting device unit,