PURPOSE: To replenish necessary knowledge, and restart a process at an interruption point and carry on the process if a deficiency in knowledge is detected while a knowledge process is in operation.

CONSTITUTION: A knowledge process part 12 processes necessary restriction conditional expressions of knowledge codes 11 in order and specifies restriction conditional expressions to be processed; if data or restriction conditional expression is not found in the knowledge codes, the process of the restriction conditional expression is interrupted, which is reported to an interruption control part 13 to request the process. The interruption control part 13 obtains knowledge information for generating the data or restriction conditional expression to be replenished from a knowledge base 10 when the information is found in the knowledge base 10 or issues a specific input request when not to obtain the knowledge information inputted from outside, generates the necessary data or restriction conditional expression from the obtained knowledge information and adds it to the knowledge code 11; and the knowledge process part 12 is informed of that and the process of the interrupted restriction conditional expression is carried on.