A method of providing a multimedia streaming service via a network, the method comprising: dividing encoded data of a video including at least one of a two-dimensional, 2D, video and a three-dimensional, 3D, video, into fragment video data in order to transmit the video data in units of fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850); wherein a fragment denotes a packet unit for streaming data via a network; determining for each fragment (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) property information including at least one of 3D signaling information including information for 2D or 3D presentation of a current video and relationship information for searching at least one other video to constitute a stereoscopic video or substitute the current video; and characterized in that the method also comprising: continuously transmitting the fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) that are each formed of an auxiliary data area (320, 340, 360, 520, 540) including the property information of the fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) and a media data area (330, 350, 370, 530, 550) including the encoded video data (335, 352, 354, 372, 374, 535, 555, 1722, 1724, 1732, 1734, 1822, 1832, 1842, 1852), through a network by using a streaming file format that is sent in units of fragments, wherein the 3D signaling information and the relationship information are transmitted via the auxiliary data area (320, 340, 360, 520, 540), and the encoded video data (335, 352, 354, 372, 374, 535, 555, 1722, 1724, 1732, 1734, 1822, 1832, 1842, 1852) is transmitted via the media data area (330, 350, 370, 530, 550). dividing encoded data of a video including at least one of a two-dimensional, 2D, video and a three-dimensional, 3D, video, into fragment video data in order to transmit the video data in units of fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850); wherein a fragment denotes a packet unit for streaming data via a network; determining for each fragment (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) property information including at least one of 3D signaling information including information for 2D or 3D presentation of a current video and relationship information for searching at least one other video to constitute a stereoscopic video or substitute the current video; and characterized in that the method also comprising: continuously transmitting the fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) that are each formed of an auxiliary data area (320, 340, 360, 520, 540) including the property information of the fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) and a media data area (330, 350, 370, 530, 550) including the encoded video data (335, 352, 354, 372, 374, 535, 555, 1722, 1724, 1732, 1734, 1822, 1832, 1842, 1852), through a network by using a streaming file format that is sent in units of fragments, wherein the 3D signaling information and the relationship information are transmitted via the auxiliary data area (320, 340, 360, 520, 540), and the encoded video data (335, 352, 354, 372, 374, 535, 555, 1722, 1724, 1732, 1734, 1822, 1832, 1842, 1852) is transmitted via the media data area (330, 350, 370, 530, 550). continuously transmitting the fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) that are each formed of an auxiliary data area (320, 340, 360, 520, 540) including the property information of the fragments (310, 312, 314, 501, 502, 1320-1350, 1720, 1730, 1820-1850) and a media data area (330, 350, 370, 530, 550) including the encoded video data (335, 352, 354, 372, 374, 535, 555, 1722, 1724, 1732, 1734, 1822, 1832, 1842, 1852), through a network by using a streaming file format that is sent in units of fragments, wherein the 3D signaling information and the relationship information are transmitted via the auxiliary data area (320, 340, 360, 520, 540), and the encoded video data (335, 352, 354, 372, 374, 535, 555, 1722, 1724, 1732, 1734, 1822, 1832, 1842, 1852) is transmitted via the media data area (330, 350, 370, 530, 550).