In a micro processor unit, when processing to be requested to another processor unit which connects via a network, occurs during task processing in a task processing unit in an application SPU, a communication controller in a PU specifies a network with which a processor unit, which is a request destination, connects. An interface selector in the application SPU selects one network included in the specified networks, with the view of communication capability or the like, and writes that information in a look-aside buffer. In case that processing for the same processing target is requested next time and after that, a system SPU or the PU transmits the processing request depending on required communication capability.