To quickly and efficiently confirm the effect of information provision by e-mails if information about a game parlor is provided to customers by use of e-mails.

When e-mails are sent to the cellular phones 20 of predetermined members managed by a member management device 11, a mail delivery log is acquired and stored in a mail delivery long storage part 11d. A visiting member log including information about members who visited the game parlor after the e-mails had been sent is acquired and stored in a visiting member log storage part 11e, and based on the mail delivery log and the visiting member log, a graph originating process part 11h responds to the e-mail and graphically displays the number of members who visited the game parlor.