Content delivery system, delivery server, receiving terminal, and content delivery method

A content delivery method for transmitting content transmitted from a transmitting terminal to a receiving terminal via a delivery server, the method comprising:

• registering a device ID identifying a receiving terminal with the delivery server;
• sorting and managing contents by the delivery server, wherein the contents transmitted from transmitting terminals are sorted by receiver terminal's device ID to which each content is destined;
• and, in response to a request from a receiving terminal, transmitting by the delivery server a content destined to the receiving terminal's device ID to the receiving terminal;
• wherein, when storing and transmitting content, the delivery server charges the content sender and, in a case of an expiry date until which the content to be viewed is set, the expiry date is extended by changing from sender charging to a receiver charging;
• and wherein, in a case of an expiry date until which the content to be viewed is set, a preservation fee is discounted if the content is erased earlier than a predetermined number of days before the expiry date.

A delivery server storing content transmitted from a transmitting terminal and transmitting the content to a receiving terminal, the delivery server comprising:

• a database for registering a device ID identifying a receiving terminal;
• a content storage for temporarily storing contents transmitted from transmitting terminals;
• and a table for sorting and managing contents by receiver terminal's device ID and by sender;
• wherein, in response to a request from a receiving terminal, the delivery server refers to the table and transmits content destined to the receiving terminal's device ID to the receiving terminal;
• wherein, when storing and transmitting content, the delivery server charges the content sender and, in a case of an expiry date until which the content to be viewed is set, the expiry date is extended by changing from sender charging to a receiver charging;
• and wherein, in a case of an expiry date until which the content to be viewed is set, a preservation fee is discounted if the content is erased earlier than a predetermined number of days before the expiry date.

A receiving terminal that receives content transmitted from a transmitting terminal via a delivery server, the receiving terminal comprising;

• a device ID storage for storing a device ID identifying the receiving terminal;
• a selector for selecting a content to receive or a content sender;
• and a display for displaying received content, wherein, by sending the device ID of the receiving terminal to the delivery server, the receiving terminal acquires and displays a list of contents destined to the receiving terminal, stored on the delivery server, or a list of senders;
• wherein, when storing and transmitting content, the delivery server charges the content sender and, in a case of an expiry date until which the content to be viewed is set, the expiry date is extended by changing from sender charging to a receiver charging;
• and wherein, in a case of an expiry date until which the content to be viewed is set, a preservation fee is discounted if the content is erased earlier than a predetermined number of days before the expiry date.