To provide a mobile portable terminal access detector and electronic mail communication equipment that can grasp information of a user carrying a portable phone or a PHS and arrived in a prescribed area and transmit information by an electronic mail to the portable phone or the PHS of the user.

When an antenna receiving a radio wave within a prescribed area detects a radio wave of the portable phone or the PHS, the communication equipment refers to a contractor database on the basis of a telephone number denoted by the radio wave and transmits information of an information provider and the user to the user and the information provider by an electronic mail when the user is a proposed user in advance by means of a proposed method and proposed contents.