PROBLEM TO BE SOLVED: To provide technology for stabilizing combustion at the start-up of an internal combustion engine, while generating requirement output at restoration to normal fuel injection control from fuel cut control, in a hybrid system having an EGR device. SOLUTION: This controller for the hybrid system has: the EGR device making a part of exhaust emission from the internal combustion engine flow into an intake system of the internal combustion engine as EGR gas; a means for performing the fuel cut control to stop fuel injection in the internal combustion engine; a decision means deciding whether an EGR rate of gas took into the internal combustion engine is not more than a prescribed limit EGR rate at which a misfire does not occur in the internal combustion engine; and a means for continuing the fuel cut control without restoring the internal combustion engine to the normal fuel injection control during a period, until it is decided by the decision means that the EGR rate becomes not larger than the limit EGR rate, after a condition to be restored is satisfied, when the condition to be restored to the normal fuel injection control from the fuel cut control is satisfied during execution of the fuel cut control, and performing control, such that the required output is generated by only an electric motor. COPYRIGHT: (C)2009,JPO&INPIT