A transmission device comprising: a meta file generating unit configured to generate a meta file including information used by a client terminal to acquire a predetermined number of video data streams of given content deliverable by a delivery server via a network; and a meta file transmitting unit configured to upon receiving a transmission request from the client terminal, transmitting the meta file to the client terminal via the network, wherein the meta file generating unit is configured to set, in the meta file, an index regarding a cache of each of the video data streams in the network, characterized in that the predetermined number of video data streams are multi-view video data streams that constitute a three-dimensional image, wherein the meta file generating unit is configured to determine the index regarding a cache of each of the multi-view video data streams on the basis of viewpoint groups classified using estimated frequency of a request for delivery of each of the multi-view video data streams, each viewpoint group having a number of viewpoints in which each viewpoint represents a respective position from which a video data stream was captured, and wherein the index regarding a cache indicates a cache priority or a cache expiry time of a corresponding video data stream in the network and wherein the index is set so as to correspond to the number of viewpoints in the viewpoint groups as compared to each other such that the video data stream or streams of a first viewpoint group having a first number of viewpoints will have a higher priority or a longer expiry time as compared to the video data stream or streams of a second viewpoint group having a second number of viewpoints, in which the first number is less than the second number. a meta file generating unit configured to generate a meta file including information used by a client terminal to acquire a predetermined number of video data streams of given content deliverable by a delivery server via a network; and a meta file transmitting unit configured to upon receiving a transmission request from the client terminal, transmitting the meta file to the client terminal via the network, wherein the meta file generating unit is configured to set, in the meta file, an index regarding a cache of each of the video data streams in the network, characterized in that the predetermined number of video data streams are multi-view video data streams that constitute a three-dimensional image, wherein the meta file generating unit is configured to determine the index regarding a cache of each of the multi-view video data streams on the basis of viewpoint groups classified using estimated frequency of a request for delivery of each of the multi-view video data streams, each viewpoint group having a number of viewpoints in which each viewpoint represents a respective position from which a video data stream was captured, and wherein the index regarding a cache indicates a cache priority or a cache expiry time of a corresponding video data stream in the network and wherein the index is set so as to correspond to the number of viewpoints in the viewpoint groups as compared to each other such that the video data stream or streams of a first viewpoint group having a first number of viewpoints will have a higher priority or a longer expiry time as compared to the video data stream or streams of a second viewpoint group having a second number of viewpoints, in which the first number is less than the second number.