A data distribution device includes: a memory configured to store cache data of data to be distributed; and a processor coupled to the memory and configured to: read the cache data from the memory in accordance with a request message received from other devices to distribute the cache data to the other devices, update, when the request message is received, a counter value that gets closer to a given value with time, so as to make the counter value move away from the given value in accordance with a reference value that is a reciprocal of a threshold value of a reception rate of the request message, whether or not to store the cache data being determined based on the reception rate; and discard the cache data in the memory when the counter value becomes the given value.