A frame coordinating computer 154, upon receiving a bidding popularity from a bid management computer 152(S1), determines whether a multiple-view video frame distributed as a content should be changed to an ad frame (S2). When it is determined that the multiple-view video frame distributed as the content should be changed to an ad frame, a change request is transmitted (S4). A content distributing computer 156P1, upon receiving such a change request (S11), changes one of content frames is changed to an ad frame (S12). Ad frame management system flexibly changes the number of ad frames in accordance with the advertisement demand by dynamically changing the number of ad frames.