A laser irradiation apparatus comprising: multiple irradiation units each configured to emit a laser beam to a surface of a base to form a pattern including at least one of a character, a code, a figure or an image, the multiple irradiation units , including: a first irradiation unit configured to emit a first laser beam; and a second irradiation unit configured to emit a second laser beam; and a controller configured to: control the first irradiation unit to irradiate only a first irradiation region on a surface of a base with the first laser beam; and control the second irradiation unit to irradiate only a second irradiation region on the surface of the base with the second laser beam, wherein the first irradiation region and the second irradiation region are not overlapping each other wherein the surface of the base (a1) includes multiple subdivided regions (13A-13E) not overlapping each other, and the controller is further configured to: determine which one or more of the multiple subdivided regions (13A-13E) are included in the first irradiation region or the second irradiation region, set one or more subdivided regions, in which a pattern is to be formed with a high accuracy, of the multiple subdivided regions (13A-13E) to the fist irradiation region, and set one or more subdivided regions, in which a pattern is to be formed with a high speed, of the multiple subdivided regions (13A-13E) to the second irradiation region. multiple irradiation units each configured to emit a laser beam to a surface of a base to form a pattern including at least one of a character, a code, a figure or an image, the multiple irradiation units , including: a first irradiation unit configured to emit a first laser beam; and a second irradiation unit configured to emit a second laser beam; and a first irradiation unit configured to emit a first laser beam; and a second irradiation unit configured to emit a second laser beam; and a controller configured to: control the first irradiation unit to irradiate only a first irradiation region on a surface of a base with the first laser beam; and control the second irradiation unit to irradiate only a second irradiation region on the surface of the base with the second laser beam, wherein the first irradiation region and the second irradiation region are not overlapping each other control the first irradiation unit to irradiate only a first irradiation region on a surface of a base with the first laser beam; and control the second irradiation unit to irradiate only a second irradiation region on the surface of the base with the second laser beam, wherein the first irradiation region and the second irradiation region are not overlapping each other wherein the surface of the base (a1) includes multiple subdivided regions (13A-13E) not overlapping each other, and the controller is further configured to: determine which one or more of the multiple subdivided regions (13A-13E) are included in the first irradiation region or the second irradiation region, set one or more subdivided regions, in which a pattern is to be formed with a high accuracy, of the multiple subdivided regions (13A-13E) to the fist irradiation region, and set one or more subdivided regions, in which a pattern is to be formed with a high speed, of the multiple subdivided regions (13A-13E) to the second irradiation region. determine which one or more of the multiple subdivided regions (13A-13E) are included in the first irradiation region or the second irradiation region, set one or more subdivided regions, in which a pattern is to be formed with a high accuracy, of the multiple subdivided regions (13A-13E) to the fist irradiation region, and set one or more subdivided regions, in which a pattern is to be formed with a high speed, of the multiple subdivided regions (13A-13E) to the second irradiation region. <EOS>