Disclosed is an image forming apparatus that may communicate with a server, which may include: a storage that stores a virus pattern file; and a hardware processor that discriminates, when a transition is made from a state in which power supply to the hardware processor is interrupted to a state in which the power supply to the hardware processor is made, whether the virus pattern file in the storage is a latest version, in communication with the server, includes an updater that updates, when discriminating that the virus pattern file is not the latest version, the virus pattern file to a virus pattern file from the server, discriminates whether a job accepted is a first type of job using data from outside the image forming apparatus or a second type of job using data generated inside the image forming apparatus, and executes the first type after the update by the updater.