Information processing apparatus, communication system, information processing method and program

An information processing apparatus, comprising:

• circuitry configured to perform control for
• adding a notification information field to a request information field for requesting each of a plurality of different apparatuses for a confirmation response to specific data from among a plurality of data transmitted to the plurality of different apparatuses, the request information field regarding a start sequence number for the confirmation response, the notification information field regarding sequence numbers described in a bitmap of a variable length corresponding to the specific data from among the plurality of data for the confirmation response, the variable length being based on a set value of a compressed bitmap, and
• transmitting the notification information field together with the request information field, to which the notification information field is added, and an indication that the notification information is added, to each of the plurality of different apparatuses.