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.