NODE, COMMUNICATION SYSTEM, AND COMMUNICATION METHOD

If an individual node selects a communication path to a master node which requires the smallest cost of communication, the number of relay nodes that perform relaying to a destination node may be increased. This may raise the communication cost required for completing communication processing rather than reduces it. A node (1) is a node (1) that performs multi-hop communication. The node (1) includes a relay node determiner (22). The relay node determiner (22) determines a relay node which performs relaying from among relay node candidates. Each of the relay node candidates has path information of a path from a corresponding one of the relay node candidates to a master node. At least when the communication frequencies of the relay node candidates are within a predetermined range, the relay node determiner (22) determines the relay node so that a relay node candidate whose communication frequency is higher is more likely to be determined as the relay node than a relay node candidate whose communication frequency is lower.