1. A method for providing a multimedia streaming service, comprising: transmitting, by a server, a Media Presentation Description (MPD) including information about media data to a client; receiving from the client, by the server, a partial request message requesting a part of media data having a range according to a defined range in the MPD; and transmitting to the client, by the server, a segment having the range in response to the partial request message, wherein the segment includes at least one fragment, segment index information including information indicating a position of the at least one fragment in the segment, and fragment index information including information indicating a position of each of a plurality of samples included in the at least one fragment, and wherein the fragment index information includes information about a total size of the samples.