http version 1 1 the format of response message is determined by checking a header field for discriminating transmission ways identified in the arrived message i e a transfer encoding field when the transfer encoding field is chunked it represents that the multimedia message is transmitted by a chunked transfer way on the other hand the transfer encoding field is not defined in http edition 1 0 and its transfer method is to inform the mobile apparatus of message length and then start to transmit data to the other side like the format as shown in fig3 a because a mobile apparatus may receive multimedia messages from a message center via http version 1 0 or 1 1 the mobile apparatus first determines whether http version 1 0 or 1 1 is used if http version 1 0 is used it is capable of determining whether the received message includes the message body length of a multimedia message if the received message includes the message body length of the multimedia message the result indicates that the response message has the format as in fig3 a if the http edition 1 1 is used it is capable of determining whether the multimedia message is transmitted in a chunked transfer way according to the above mentioned transfer encoding field in step 507 if the multimedia message is transmitted by chunks the received message in step 503 is the first part of the response message as the format shown in fig3 b referring to fig3 b the first part 350 of the response message includes the first chunk 355 of multimedia message and a message length that is a.