Abstract: An information processor receives a changed content check request on information managed by a user of a different system from a user terminal and a first condition is stored, the first condition being included in the check request and specifying a check target. A second condition specifying a changed content to be retrieved from among changed contents on the information managed by the user of the different system is received from the user terminal. An information-changed content check request is transmitted in which the stored first condition is specified to a converter that performs protocol conversion. A changed content check result is acquired from the converter and stored, the result being returned to the converter by the user terminal of the different system. The stored check result is checked against the second condition, and the check result that matches the second condition is returned to the user terminal.

Abstract: An information processor receives a changed content check request on information managed by a user of a different system from a user terminal and a first condition is stored, the first condition being included in the check request and specifying a check target. A second condition specifying a changed content to be retrieved from among changed contents on the information managed by the user of the different system is received from the user terminal. An information-changed content check request is transmitted in which the stored first condition is specified to a converter that performs protocol conversion. A changed content check result is acquired from the converter and stored, the result being returned to the converter by the user terminal of the different system. The stored check result is checked against the second condition, and the check result that matches the second condition is returned to the user terminal.

Abstract: It is checked whether or not information requested in an information request is present in a message sharing/storing unit which stores information provided from an information provider and accessibility information setting an information requester which is allowed to access the information. It is also determined whether or not the information requester can access information requested in an information request message based on the accessibility information. When it is determined that the information requested in the information request message is already registered in the message sharing/storing unit and the information requester can access the information, information on a request-reply-message to the information requester is created based on the information in the message sharing/storing unit.

Abstract: A power and signal transmission system performs a transmission of a power from a first communication device to a second communication device via a transmission path as well as a transmission of a signal between the first and second communication devices via the transmission path. The first communication device includes a high voltage power source and a first pair of active inductances each having a low DC impedance and a high AC impedance, through which the power from the high voltage power source is supplied to the transmission path, and the second communication device includes a DC/DC converter and a second pair of active inductances each having a low DC impedance and a high AC impedance, through which the power transmitted via the transmission path is supplied.