Patent ID: 7457840
Filing Date: 2008-11-25
Classification: H04L

Abstract:
1. An information processing device, comprising: a memory storing a destination address to/from which an update notification indicating that data has been updated is informed; a receiver which receives update notifications from a plurality of devices; a first determining unit which determines whether or not a first update notification that indicates a same update as an update indicated by a second update notification has been received; a second determining unit which determines whether or not the second update notification has been passed through other devices other than a first device that stores an updated data; a storing unit which, when the first determining unit determines that the first update notification indicating the same update has been received, stores an address of the first device in a case that the second update notification is transferred from the first device, and which stores an address of a second device of the other devices with which a number of hops is a minimum between the second device and the first device in a case that the second update notification is not transferred from the first device; and a requesting unit which, when the first determining unit determines that the first update notification indicating the same update has not been received and the second determining unit determines that the second update notification has been passed through the other devices, requests transferring the updated data from the first device in a case that the address of the first device is stored in the destination address, and which requests transferring the updated data from the second device of which the address has been stored in a case that the address of the first device is not stored in the destination address.