Patent ID: 7464399

Claim:
A computer readable medium storing a computer program, which when executed by a portable device, manages a portable device connectable to a network and results in performance of steps comprising: acquiring access right information of a computer resource assigned to a user temporarily registered to the network system, from a computer which manages the computer resource in the network system; preserving the access right information acquired; a third program code to access the network system using the access right information preserved; sending a temporary registration request to the computer in response to a request of temporary registration from the user; sending an extension registration request to the computer in response to a request of extension of a use period of the computer resource from the user, when a message that the present time is near the end of the use period and asking whether the user postpones the use period is received from the computer; and receiving a message that use of the computer resources is completed form the computer, if the extension registration request is not sent.