Abstract: According to the present invention, multiple contract sets, which are selectable by the user of the cellular phone and which each include a phone number, an available service, a payment method and a payer as contract clauses, are registered in the single cellular phone as contracts for the respective multiple phone numbers; and the cellular phone communication system manages communications for every contract sets according to the contract clauses defined in the respective contract sets and charges rates separately for the respective contract sets.

Abstract: According to the present invention, multiple contract sets, which are selectable by the user of the cellular phone and which each include a phone number, an available service, a payment method and a payer as contract clauses, are registered in the single cellular phone as contracts for the respective multiple phone numbers; and the cellular phone communication system manages communications for every contract sets according to the contract clauses defined in the respective contract sets and charges rates separately for the respective contract sets.

Abstract: A user terminal 10 sends a rack creation request to a server 30; a sales center server 40 delivers contents purchased by the user terminal 10 to the server 30; the server 30 creates a rack in a database as a depository for contents for each customer in response to a rack creation request from the user terminal 10, then stores the contents delivered from the sales center server 30 in the rack, creates a list from the rack of the customer in response to a request for the list from the player terminal 20 sends it to the player terminal 20, and then sends to the player terminal 20 contents selected by the player terminal 20 in response to a download request for the selected contents.

Abstract: A network management system utilizing the push style in which transmission of an event from a server to a client is performed asynchronously via an event channel. The server includes a transmitter for transmitting data at a predetermined time interval, for detecting any communication errors between the server and the client. Thus, the requested client can detect errors such as a disconnection between the client and the server and a recording medium on which a network management program is recorded.

Abstract: In deletion of a managed object in a hierarchically organized network, when a deletion request of the managed object is received which has child objects included therein and at least one active managed object is included in the managed object in question, a completion waiting table is generated which contains each active managed object of the managed object in question. Monitoring the completion waiting table while updating it each time an active managed object completes the active operations, the deletion of the managed object in question is waited until each active managed object included in the managed object completes all the active operations.