Content data 30 are distributed from a content distribution device 11 to a content reproduction device 12 by way of a network 10. The content data 30 are transmitted as a content packet 31, like an IP packet, on the network 10. Packet route information 34 that includes address information about a packet source and a relay point and the like, and shows a packet transmission route on the network is stored in a header 32 of the content packet 31. A content management device 15 acquires the packet route information 34 about the content packet 31 and identifies a specific content corresponding to the packet route information according to preset content-route correspondence information showing a correlation between a content and a route, thereby performing management of a content according to a result of identification.