A controller (10) for a hybrid vehicle (HV) idles first an internal combustion engine (ICE; 12) when it is predicted that a load on the HV or a motor (14) will increase, and thereafter switches to a travelling mode in which the ICE (12) is used. Based on output of a vehicle weight sensor (62), a gradient sensor (64), a towing sensor (68), a start/power mode switch (60) and other on-board sensors or switches, it is predicted that a load on the HV or the motor (14) will increase. Otherwise, based on information obtained from a navigation system (66) or from another vehicle to be towed, it is predicted that a load on the HV or the motor (14) will increase. Based on a difference of output between an open air temperature sensor (70) and a cabin temperature sensor (72), a load on an on-board appliance (e.g., 50) is detected, and based on the detected load, it is predicted that a load on the HV or the motor (14) will increase. Thus, a delay in following the ICE (12) in response to the switching of travelling modes can be decreased or remedied.