A hybrid vehicle system comprising: an internal-combustion engine; a first electric motor; a three-axis power split mechanism that distributes power of the internal-combustion engine to the first electric motor and a power coupling mechanism; a second electric motor connected to the power coupling mechanism; an axle that is driven with energy that is supplied from the power coupling mechanism; a first inverter that drives the first electric motor; a second inverter that is connected to the first inverter via a DC link and drives the second electric motor; a rechargeable battery connected to the DC link; an anti-slip controller that outputs a torque command difference (ΔTref) such that output torque of the axle is lowered when slipping of a wheel that rotates with power from the axle is detected; a first controller that computes a torque command (T MG1 ') of the first electric motor and a torque command (T MG2 ') of the second electric motor such that torque output from the axle is equal to an axle torque command (Tref); a second controller that receives the torque command difference (ΔTref) and computes a torque command difference (ΔT MG1) of the first electric motor and a torque command difference (ΔT MG2) of the second electric motor such that a difference between energy consumption of the first electric motor and energy consumption of the second electric motor is zero; a first adder that adds the torque command (T MG1 ') of the first electric motor and the torque command difference (ΔT MG1) of the first electric motor so as to output obtained torque to the first inverter; and a second adder that adds the torque command (T MG2 ') of the second electric motor and the torque command difference (ΔT MG2) of the second electric motor so as to output obtained torque to the second inverter. an internal-combustion engine; a first electric motor; a three-axis power split mechanism that distributes power of the internal-combustion engine to the first electric motor and a power coupling mechanism; a second electric motor connected to the power coupling mechanism; an axle that is driven with energy that is supplied from the power coupling mechanism; a first inverter that drives the first electric motor; a second inverter that is connected to the first inverter via a DC link and drives the second electric motor; a rechargeable battery connected to the DC link; an anti-slip controller that outputs a torque command difference (ΔTref) such that output torque of the axle is lowered when slipping of a wheel that rotates with power from the axle is detected; a first controller that computes a torque command (T MG1 ') of the first electric motor and a torque command (T MG2 ') of the second electric motor such that torque output from the axle is equal to an axle torque command (Tref); a second controller that receives the torque command difference (ΔTref) and computes a torque command difference (ΔT MG1) of the first electric motor and a torque command difference (ΔT MG2) of the second electric motor such that a difference between energy consumption of the first electric motor and energy consumption of the second electric motor is zero; a first adder that adds the torque command (T MG1 ') of the first electric motor and the torque command difference (ΔT MG1) of the first electric motor so as to output obtained torque to the first inverter; and a second adder that adds the torque command (T MG2 ') of the second electric motor and the torque command difference (ΔT MG2) of the second electric motor so as to output obtained torque to the second inverter.