Verification system, server, and electronic instrument

The verification system of this invention comprises an image forming apparatus having verification function and a card reader for reading a user ID from a card. The image forming apparatus is capable of performing short-range radio communication with a portable instrument . The portable instrument receives a polling command transmitted by the image forming apparatus and sends back its own identification code if it is located near the image forming apparatus . The image forming apparatus permits usage of all the functions thereof if it verifies that user is an officially permitted person according to user ID read by the card reader and the identification code sent back from the portable instrument . Consequently, there is provided a verification system having a high security level and convenient for use or a verification system which permits usage of its apparatus and other related devices within an appropriate range depending on the security level of a verified method.