1. An apparatus comprising: a receiving unit configured to receive a packet transmitted via a network, while the apparatus is in a power saving mode: a determining unit configured to determine whether or not the received packet is a packet according to a predetermined protocol; an analyzing unit configured to analyze succeeding packet data described in a data description language to produce an analysis result, in a case where the packet is the packet according to the predetermined protocol; and an instructing unit configured to instruct the apparatus to return from the power saving mode to a normal power mode in response to the analysis result, wherein the determining unit determines that the received packet is a packet according to a predetermined protocol in a case where the received packet matches with a predetermined first fixed pattern; and wherein the instructing unit instructs the apparatus to return from the power saving mode to the normal power mode without analysis by the analyzing unit in a case where the received packet matches with a second fixed pattern.