A system for estimating an intention of a driver of a vehicle comprising: a detector configured to detect an operation performed by the driver; characterized by an intention estimation device (40, 50, 60, 70) configured to generate an estimated intention (λrd) of the driver based on the detected operation; and a confidence calculator configured to calculate a confidence index of the estimated intention, wherein: the intention estimation device (40, 50, 60, 70) includes: a first device configured to provide data related to a plurality of imaginary drivers, each of the plurality of imaginary drivers associated with at least one intention, wherein each of the at least one intention is associated with an operation of the respective imaginary driver; a second device configured to calculate a likelihood value for each of the plurality of imaginary drivers based on the detected operation of the driver and the respective associated operation of each of the plurality of imaginary drivers; and a third device configured to generate the estimated intention (λrd) of the driver based on the respective likelihood value of each of the plurality of imaginary drivers; and the confidence calculator is configured to calculate the confidence index of the estimated intention based on the respective likelihood value of each of the plurality of imaginary drivers. a detector configured to detect an operation performed by the driver; characterized by an intention estimation device (40, 50, 60, 70) configured to generate an estimated intention (λrd) of the driver based on the detected operation; and a confidence calculator configured to calculate a confidence index of the estimated intention, wherein: the intention estimation device (40, 50, 60, 70) includes: a first device configured to provide data related to a plurality of imaginary drivers, each of the plurality of imaginary drivers associated with at least one intention, wherein each of the at least one intention is associated with an operation of the respective imaginary driver; a second device configured to calculate a likelihood value for each of the plurality of imaginary drivers based on the detected operation of the driver and the respective associated operation of each of the plurality of imaginary drivers; and a third device configured to generate the estimated intention (λrd) of the driver based on the respective likelihood value of each of the plurality of imaginary drivers; and the confidence calculator is configured to calculate the confidence index of the estimated intention based on the respective likelihood value of each of the plurality of imaginary drivers. the intention estimation device (40, 50, 60, 70) includes: a first device configured to provide data related to a plurality of imaginary drivers, each of the plurality of imaginary drivers associated with at least one intention, wherein each of the at least one intention is associated with an operation of the respective imaginary driver; a second device configured to calculate a likelihood value for each of the plurality of imaginary drivers based on the detected operation of the driver and the respective associated operation of each of the plurality of imaginary drivers; and a third device configured to generate the estimated intention (λrd) of the driver based on the respective likelihood value of each of the plurality of imaginary drivers; and a first device configured to provide data related to a plurality of imaginary drivers, each of the plurality of imaginary drivers associated with at least one intention, wherein each of the at least one intention is associated with an operation of the respective imaginary driver; a second device configured to calculate a likelihood value for each of the plurality of imaginary drivers based on the detected operation of the driver and the respective associated operation of each of the plurality of imaginary drivers; and a third device configured to generate the estimated intention (λrd) of the driver based on the respective likelihood value of each of the plurality of imaginary drivers; the confidence calculator is configured to calculate the confidence index of the estimated intention based on the respective likelihood value of each of the plurality of imaginary drivers.