PURPOSE: To obtain a device which has elevated an overall processing speed, by inputting a status information signal to an input/output channel from an input/ output controller in advance, and storing it temporarily so that this signal can be supplied to a central processing unit.

CONSTITUTION: To an input/output channel which has received an interruption request from an input/output controller, a status information signal is inputted in advance, and is stored temporarily so that this signal can be supplied to a central processing unit. For instance, from an input/output controller IOC3, an interruption request signal 4 is sent out to an input/output channel IOP2, is set to a flip-flop 12 of the IOP2, an interruption request signal 5 is sent out to a CPU1, and a status information request signal 7 is outputted to the IOC3. Subsequently, a status information signal 8 is sent out from a status information signal holding register STSR10 of the IOC3 to an STSR11 of the IOP2, and this signal is stored by the STSR11. Subsequently, from the CPU1, a status information request signal 13 is outputted to the IOP2, and the contents of the STSR11 are outputted as a status information signal 14 to the CPU1.