Communication terminal, communication system, communication control method and program

2:

• The communication terminal according to claim 1,
• wherein the content data delivered by the delivery server include first content data sent by the first communication terminal and second content data acquired by the acquisition unit and sent to the delivery server, and
• wherein the display control unit is configured to perform a control of superposing the first content data and the second content data and displaying the superposed content data.

3:

• The communication terminal according to claim 2,
• wherein the first content data include stroke data and the second content data include stroke data.

4:

• The communication terminal according to claim 2, further comprising a conversion unit configured to convert the second content data into data with a format that can be sent in the communication controlled by the first communication control unit,
• wherein the first content data are different from the second content data.

5:

• The communication terminal according to claim 4, further comprising a conversion unit configured to convert video data transmitted between the communication terminal and the second communication terminal in the communication controlled by the second communication control unit into data of a plurality of still images that can be sent in the communication controlled by the first communication control unit,
• wherein the second content data include video data.

7:

• The communication terminal according to claim 1,
• wherein the second communication control unit is configured to send the content data delivered by the delivery server to the second communication terminal.

9:

• The communication system according to claim 8,
• wherein the first communication terminal includes the first communication control unit, and
• wherein the second communication terminal includes the second communication control unit.

11-12. (canceled)