Patent ID: 7962744

Claim:
A terminal communication method, comprising: obtaining, at a portable terminal, specified data from a server not via a service terminal; obtaining, at the service terminal from a certificate authority, a server certificate encrypted by a secret key of the certificate authority, the server certificate indicating certification of the service terminal, the service terminal being a device different from the server; receiving, at the portable terminal, a communication application from the server not via the service terminal, the communication application comprising a public key of the certificate authority and a program for performing local communication with the service terminal, obtaining, at the portable terminal, the server certificate from the service terminal; verifying, at the portable terminal, the server certificate on the basis of the public key of the certificate authority included in the communication application; and when the service terminal is authenticated by the portable terminal on the basis of the server certificate, transmitting, from the portable terminal to the service terminal, the specified data using local communication without a network by executing the program, in the communication application, to authenticate the portable terminal and perform local communication with the service terminal.