The image forming device includes an image data input unit that receives image data of a document; a set password acquisition unit that acquires information regarding a password from the image data received by the image data input unit; an input password receiving unit that starts reception of input of the password before the reception of the image data of all pages of the document is completed by the image data input unit; a password verification unit that performs verification between an input password and a set password; and a job execution unit that cancels execution limit of a job based on a verification result and executes the job, wherein, when the password is set in arbitrary one page of the document, the image data input unit sequentially completes the reception of the image data of the next page of the arbitrary one page of the document, before the input of the password corresponding to the password set in the arbitrary one page is completed by the input password receiving unit.