Communication terminal, communication system, communication method, and non-transitory computer-readable medium

A communication system, comprising:

• a first communication terminal;
• and
• a second communication terminal as a destination candidate to which the first communication terminal transmits a request, wherein
• the first communication terminal includes circuitry to:
• accept designation of an attribute,
• receive first attribute information and first presence information ofa first destination candidate and second attribute information and second presence information of a second destination candidate,
• transmit a first request to the first destination candidate, the first attribute information indicating the attribute and the first presence information indicating a first presence,
• transmit a second request to the second destination candidate after the circuitry determines that the second attribute information indicates the attribute and the second presence information indicates the first presence,
• receive, after the circuitry transmits the second request, third attribute information and third presence information of a third destination candidate in response to the third destination candidate satisfying a condition that was not satisfied at a time of transmitting the second request, the third destination candidate being different than the first destination candidate and the second destination candidate,
• determine whether the third attribute information indicates the attribute, and
• transmit, in response to determining that the third attribute information indicates the attribute, a third request to the third destination candidate.

A communication method comprising:

• accepting designation of an attribute;
• receiving first attribute information and first presence information of a first destination candidate and second attribute information and second presence information of a second destination candidate;
• transmitting a first request to the first destination candidate, the first attribute information indicating the attribute and the first presence information indicating a first presence;
• transmitting a second request to the second destination candidate after determining that the second attribute information indicates the attribute and the second presence information indicates the first presence;
• receiving, after transmitting the second request, third attribute information and third presence information of a third destination candidate in response to the third destination candidate satisfying a condition that was not satisfied at a time of transmitting the second request, the third destination candidate being different than the first destination candidate and the second destination candidate;
• determining whether the third attribute information indicates the attribute;
• and
• transmitting, in response to determining that the third attribute information indicates the attribute, a third request to the third destination candidate.

A non-transitory computer-readable storage medium storing a computer-executable product that causes a communication terminal to perform a communication method comprising:

• accepting designation of an attribute;
• receiving first attribute information and first presence information ofa first destination candidate and second attribute information and second presence information of a second destination candidate;
• transmitting a first request to the first destination candidate, the first attribute information indicating the attribute and the first presence information indicating a first presence;
• transmitting a second request to the second destination candidate after determining that the second attribute information indicates the attribute and the second presence information indicates the first presence;
• receiving, after transmitting the second request, third attribute information and third presence information of a third destination candidate in response to the third destination candidate satisfying a condition that was not satisfied at a time of transmitting the second request, the third destination candidate being different than the first destination candidate and the second destination candidate;
• determining whether the third attribute information indicates the attribute;
• transmitting, in response to determining that the third attribute information indicates the attribute, a third request to the third destination candidate.