1. A running locus generating method of generating a future running locus of a vehicle driven by a hybrid scheme, the method comprising: a constraint condition computing step of convergently computing a constraint condition including at least a road boundary condition and an evaluation function computing step of deriving a running locus by a convergent computation with an evaluation function including at least an evaluation of an electric power balance in a hybrid system when the electric power balance is positive in a state where the constraint condition in the constraint condition computing step is satisfied.