An in-car information system including a portable information terminal and an in-car device, wherein: the information terminal comprises a storage means for storing a plurality of applications and first regulatory information indicating a group to which each application belongs, a control means that executes an application, among the plurality of applications stored in the storage means, in a foreground, and an image output means for outputting an image corresponding to the application being executed in the foreground by the control means to the in-car device; and the in-car device comprises a display means for displaying the image output from the information terminal, an operation input means for inputting an operation performed by a user, an operation information transmission means for transmitting operation information corresponding to the operation input via the operation input means to the information terminal, and an in-car storage means for storing second regulatory information pertaining to operational restrictions to be imposed in correspondence to each group while a vehicle is in a traveling state; characterized in that, the information terminal transmits group information corresponding to the group to which the application belongs to the in-car device, by identifying a specific application being executed in the foreground by the control means and referencing the first regulatory information; and in that the in-car device determines details of the operational restrictions to be imposed in correspondence to the group to which the application belongs while the vehicle is in a traveling state by referencing the second regulatory information based upon the group information transmitted from the information terminal and either allows or disallows display of the image at the display means and transmission of the operation information via the operation information transmission means. the information terminal comprises a storage means for storing a plurality of applications and first regulatory information indicating a group to which each application belongs, a control means that executes an application, among the plurality of applications stored in the storage means, in a foreground, and an image output means for outputting an image corresponding to the application being executed in the foreground by the control means to the in-car device; and the in-car device comprises a display means for displaying the image output from the information terminal, an operation input means for inputting an operation performed by a user, an operation information transmission means for transmitting operation information corresponding to the operation input via the operation input means to the information terminal, and an in-car storage means for storing second regulatory information pertaining to operational restrictions to be imposed in correspondence to each group while a vehicle is in a traveling state; characterized in that, the information terminal transmits group information corresponding to the group to which the application belongs to the in-car device, by identifying a specific application being executed in the foreground by the control means and referencing the first regulatory information; and in that the in-car device determines details of the operational restrictions to be imposed in correspondence to the group to which the application belongs while the vehicle is in a traveling state by referencing the second regulatory information based upon the group information transmitted from the information terminal and either allows or disallows display of the image at the display means and transmission of the operation information via the operation information transmission means.