REPLACEMENT DEVICE, DISTRIBUTION DEVICE, CACHE DEVICE, PROGRAM, DISTRIBUTION METHOD, AND CACHE METHOD

PROBLEM TO BE SOLVED: To improve viewer convenience during video data playback.SOLUTION: A replacement device includes: a specific frame detection unit 201 for detecting a specific frame including specific information among video frames included in video data stored in a data storage device 208; a data request unit 202 for requesting replacement frame data, not including the specific information, corresponding to the specific frame detected by the specific frame detection unit 201, through a communication network; a data reception unit 203 for receiving through the communication network the replacement frame data supplied in response to the request from the data request unit 202; and a replacement unit 209 for changing the video content by replacing the specific frame data using the replacement frame data received by the data reception unit 203.