Patent ID: 8364777

Claim:
A content delivery server delivering content to at least one communication terminal over a communication network, comprising: a communication device communicating with the communication terminal; a storage device storing information, wherein the storage device stores delivery management information representing a correspondence relationship between (a) terminal identification information by which the communication terminal is identified, (b) user identification information by which a user of that communication terminal is identified, and (c) delivered content which is content already delivered to a communication terminal corresponding to the terminal identification information and received by the communication terminal: an information obtaining section obtaining the terminal identification information and the user identification information from the communication terminal; an identifying section retrieving the delivery management information from the storage device, to identify terminal identification information and delivered content each corresponding to the user identification information obtained by the information obtaining section, based on the retrieved delivery management information; and a delivery section which, when the terminal identification information identified by the identifying section differs from the terminal identification information obtained by the information obtaining section, delivers content which is capable of same processing as the delivered content identified by the identifying section and which corresponds to the terminal identification information obtained by the information obtaining section, to the communication terminal, the user identification information includes (i) user identification inside information which is user identification information identified by the content delivery server, and (ii) user identification outside information which is user identification information identified by another external device, the content delivery server further comprising a user information updating section updating the user identification outside information in the delivery management information, stored in the storage device, which corresponds to the user identification inside information, to the user identification outside information in the user identification information obtained by the information obtaining section, the identifying section identifying, by using the user identification outside information as the user identification information, the terminal identification information and the delivered content corresponding to the user identification outside information.