Patent ID: 8422048

Claim:
An image forming apparatus that is connected to an information processing apparatus and processes a job received from the information processing apparatus, the image forming apparatus comprising: an authentication unit configured to authenticate a user; a holding unit configured to hold a plurality of pieces of user information and key information corresponding to the respective pieces of user information in association with a user identifier that is necessary for the user authentication; a determination unit configured to determine a job for which user information associated with the job matches the user identifier held by the holding unit; a verification unit configured to verify signature data attached to the job determined by the determination unit, based on the user information and the key information; an addition unit configured to add the job to a job list when the verification of the signature data attached to the job by the verification unit has succeeded; a display unit configured to display the job list added to by the addition unit; an accepting unit configured to accept an instruction to output a job displayed by the display unit from the user; and an output unit configured to output the job accepted from the information processing apparatus, wherein the display unit displays a job list including a job whose signature is unverifiable in addition to a job whose signature has been verified.