Each CPU registers jobs of its own in the form of nodes in a normal node queue, executes the registered jobs in a registration order, has a queue (remote node queue) for registering a job requested by another CPU in the form of a node, and executes the remote nodes in a registration order as in the normal nodes. When the first CPU causes the second CPU to execute a job, the first CPU transmits the job in the form of a node processed by the second CPU. The second CPU registers the received node in the remote node queue and executes it as in the normal node. The second CPU sends back, to the first CPU, the processing result of the received node in the form of a node processed by the first CPU, as needed.