1. An imaging apparatus for authenticating a user comprising: a palm guide unit for guiding an imaging area of a palm; a finger guide unit for guiding an imaging area of a finger; an imaging unit for imaging biometric data of said imaging area of the palm and the finger of the user; an image storing unit for storing at least one finger image and at least one palm image; and a matching unit for matching said imaged finger and said imaged palm data with said stored finger image and said stored palm image, wherein said matching unit includes: a selecting unit for selecting a finger image from said storing unit based on feature amount of said imaged finger data and that of said stored finger image; an authentication unit for authenticating the user based on the result of matching the stored palm image corresponding to said selected finger image with said imaged palm data.