Importance

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Abstract

Disclosed is a technique for providing a binding updating method and the like, capable of reducing the number of messages, and hence the power consumption of terminals and processing time required for binding update between terminals. According to the technique, the method includes the following steps: A predetermined mobile terminal sends a mobile terminal as the next destination first and second messages including predetermined information for each of other mobile terminals based on a predetermined order of message transmission. A mobile terminal that has received the first and second messages acquires predetermined information addressed to its own terminal, adds predetermined information for each of mobile terminals other than its own terminal to the first and second messages, and sends the first and second messages to a mobile terminal as the next destination based on the predetermined order of message transmission. A mobile terminal that has acquired all pieces of predetermined information addressed to its own terminal generates authentication information for each of the other mobile terminals based on the predetermined information, and creates and sends a third message including the authentication information for each of the other mobile terminals. A terminal that has received the third message updates binding information when the authentication information included in the third message is valid.

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First Claim