A computer readable medium storing a program causing a computer to execute a process for controlling a printing process, the process including: receiving instruction information including (i) a content of the printing process for printing image data and (ii) identification information of an instruction user instructing the printing process, the content of the printing process which includes detailed information for printing the image data; acquiring when the instruction information is received, third-person information indicating a third person staying around a printing apparatus which performs the printing process; determining whether or not the third person indicated by the acquired third-person information has a certain relation with the instruction user indicated by the identification information included in the received instruction information; and determining a mode of the printing process in the printing apparatus; and controlling the printing process in the determined mode.