A content transmission method including: searching, when a first information processing device receives a transmission request for a first content from a second information processing device, for a third information processing device within information processing devices, at least one of the information processing devices having a connection with the second information processing device and currently transmitting a second content to the second information processing device; and transmitting to the third information processing device, by the first information processing device, the first content and an instruction to transmit the transmitted first content from the third information processing device to the second information processing device in accordance with the transmission request.