A system comprising an image processing apparatus, a mobile terminal and a service provision system, wherein the image processing apparatus has a communication function capable of communicating with the mobile terminal including an authentication module for biometric authentication and a storage area having tamper resistance, wherein the storage area is configured to store biometric information about a user and a secret key generated in registering the biometric information, the biometric information being needed when the authentication module performs the biometric authentication; wherein the image processing apparatus comprises request means for transmitting a request for service at the image processing apparatus to the service provision system in response to an input from the user to the image processing apparatus; wherein the service provision system comprises verification generating means for generating, by the service provision system, verification data for the request and transmitting the verification data to the image processing apparatus; wherein the image processing apparatus further comprises: identification means for identifying an authentication module to perform biometric authentication of the user upon receiving the verification data, wherein the authentication module included in the mobile terminal different from the image processing apparatus which has received the input from the user is identified as the authentication module to perform the biometric authentication; and first transmission means for transmitting the verification data to the mobile terminal in which the identified authentication module is included; and wherein the mobile terminal comprises signature generating means for generating a signature of the verification data using the secret key upon successful biometric authentication of the user by the authentication module and transmitting the signature to the image processing apparatus; wherein the image processing apparatus further comprises second transmission means for transmitting the signature to the service provision system, and wherein the service provision system further comprises providing means for verifying the signature using a public key corresponding to the secret key and providing the service to the user at the image processing apparatus. wherein the storage area is configured to store biometric information about a user and a secret key generated in registering the biometric information, the biometric information being needed when the authentication module performs the biometric authentication; wherein the image processing apparatus comprises request means for transmitting a request for service at the image processing apparatus to the service provision system in response to an input from the user to the image processing apparatus; wherein the service provision system comprises verification generating means for generating, by the service provision system, verification data for the request and transmitting the verification data to the image processing apparatus; wherein the image processing apparatus further comprises: identification means for identifying an authentication module to perform biometric authentication of the user upon receiving the verification data, wherein the authentication module included in the mobile terminal different from the image processing apparatus which has received the input from the user is identified as the authentication module to perform the biometric authentication; and first transmission means for transmitting the verification data to the mobile terminal in which the identified authentication module is included; and identification means for identifying an authentication module to perform biometric authentication of the user upon receiving the verification data, wherein the authentication module included in the mobile terminal different from the image processing apparatus which has received the input from the user is identified as the authentication module to perform the biometric authentication; and first transmission means for transmitting the verification data to the mobile terminal in which the identified authentication module is included; and wherein the mobile terminal comprises signature generating means for generating a signature of the verification data using the secret key upon successful biometric authentication of the user by the authentication module and transmitting the signature to the image processing apparatus; wherein the image processing apparatus further comprises second transmission means for transmitting the signature to the service provision system, and wherein the service provision system further comprises providing means for verifying the signature using a public key corresponding to the secret key and providing the service to the user at the image processing apparatus.