Communication contents certification system, communication contents certification apparatus, communication contents certification method, and recording medium

A communication contents certification method for certifying contents of an electronic mail communicated between two or more party communication terminals and two or more attorney communication terminals through a network, the communication contents certification method comprising:

• storing, at a contents certification apparatus, a personal ID and password, issued to each party and utilized for a particular transaction between a first party and a second party
• transmitting, from a communication terminal of the first party, an electronic mail to the contents certification apparatus;
• confirming the first party is authentic, at the contents certification apparatus, based on the personal ID and password of the first party;
• transmitting, from the contents certification apparatus, to a communication terminal of a first attorney, the electronic mail;
• adding first comment data to the email at the communication terminal of the first attorney;
• transmitting, from the communication terminal of the first attorney to the contents certification apparatus, the email with the first comment data;
• confirming the first attorney is authentic, at the contents certification apparatus, based on the personal ID and password of the first attorney;
• transmitting, from the contents certification apparatus, the email with the first comment data, to the communication terminal of the first party;
• inserting first message data, at the communication terminal of the first party, in the email, the first message data being based on the first comment data provided by the first attorney;
• transmitting, from a communication terminal of the first party, the electronic mail with the first message data, to the contents certification apparatus;
• confirming the first party is authentic, at the contents certification apparatus, based on the personal ID and password of the first party;
• transmitting, from the contents communication apparatus, the electronic mail with the first message data, to a communication terminal of the second party;
• adding second message data to the email at the communication terminal of the second party;
• transmitting, from the communication terminal of the second party to the contents certification apparatus, the email with the second message data;
• confirming the second party is authentic, at the contents certification apparatus, based on the personal ID and password of the second party;
• transmitting, from the contents certification apparatus, the email with the second message data, to a communication terminal of a second attorney;
• inserting second comment data, at the communication terminal of the second attorney, in the email based on the second message data;
• transmitting, from a communication terminal of the second attorney, the electronic mail with the second comment data, to the contents certification apparatus;
• confirming the second attorney is authentic, at the contents certification apparatus, based on the personal ID and password of the second attorney;
• transmitting, from the certification apparatus to the communication terminal of the second party, the electronic mail including the second comment data;
• transmitting, from the communication terminal of the second party, the electronic mail including the second comment data, to the contents certification apparatus;
• confirming the second party is authentic, at the contents certification apparatus, based on the personal ID and password of the second party;
• transmitting, from the certification apparatus to the communication terminal of the first party, the electronic mail including the second comment data.