To reduce the man-hour required in tuning control parameters, a vehicular control system of this invention comprises a user parameter input module, an external parameter input module, a plurality of objective functions, a policy setting module, and a policy node. The user parameter input module inputs a user parameter corresponding to an operation of a user. The external parameter input module inputs an external parameter resulting from an outside environment. The objective functions are set for each control characteristic respectively so as to calculate an internal parameter of each control target from the user parameter and the external parameter. The policy setting module sets policies indicating a control index of the user for the objective functions respectively. The policy node weights the objective functions on the basis of the policies, adjusts the internal parameter in accordance with the policy so that the internal parameter is optimized (minimized or maximized) among the objective functions, and issues a command to a control node corresponding to the internal parameter.