An information terminal includes: an operation assignment information storage unit that stores operation assignment information; an actuation information reception unit that receives from an in-car device actuation information; an assignment unit that, on the basis of the operation assignment information and the actuation information, assigns some among a plurality of operations in the information terminal to each of one or more actuations among a plurality of types of actuation that can be inputted with an actuation unit provided to the in-car device respectively, according to priority levels; an actuation signal reception unit that receives an actuation signal outputted from the in-car device; and a conversion unit that, on the basis of the result of assignment by the assignment unit, converts the actuation signal into an operating command that corresponds to one among the plurality of operations.